| Congress[a] | District | Original | Cause of vacancy | Winner | Date[b]
(linked to election article) |
| 1st | NH at-large | Benjamin West[c] (Pro-Admin) | Declined to serve | Abiel Foster (Pro-Admin) | June 22, 1789[d] |
| 1st | VA 9 | Theodorick Bland (Anti-Admin) | Died | William B. Giles (Anti-Admin) | July 1790[d] |
| 1st | CT at-large | Pierpont Edwards[e] (Pro-Admin) | Resigned | Jeremiah Wadsworth (Pro-Admin) | December 16, 1790[d] |
| 2nd | NY 1 | James Townsend[e] (Pro-Admin) | Died | Thomas Tredwell (Anti-Admin) | April 26–28, 1791[d] |
| 2nd | CT at-large | Roger Sherman (Pro-Admin) | Declined to serve | Amasa Learned (Pro-Admin) | September 19, 1791[d] |
| 2nd | MD 3 | William Pinkney (Pro-Admin) | Resigned | John Francis Mercer (Anti-Admin) | October 26–29, 1791[d] |
| 2nd | GA 1 | Anthony Wayne (Anti-Admin) | Disqualified | John Milledge (Anti-Admin) | July 9, 1792[d] |
| 2nd | MD 2 | Joshua Seney (Anti-Admin) | Resigned | William Hindman (Pro-Admin) | January 7–10, 1793[d] |
| 3rd | CT at-large | Jonathan Sturges[e] (Pro-Admin) | Resigned | Uriah Tracy (Pro-Admin) | April 8, 1793[d][f] |
| 3rd | CT at-large | Benjamin Huntington (Pro-Admin) | Declined to serve | Jonathan Ingersoll (Pro-Admin) | September 16, 1793[d] |
| 3rd | CT at-large | Stephen M. Mitchell (Pro-Admin)
Jonathan Ingersoll (Pro-Admin) | Declined to serve | Joshua Coit (Pro-Admin)
Zephaniah Swift (Pro-Admin) | November 11, 1793[d] |
| 3rd | MD 2 | John Francis Mercer (Anti-Admin) | Resigned | Gabriel Duvall (Anti-Admin) | May 5, 1794[d] |
| 3rd | SC 5 | Alexander Gillon (A) | Died October 6, 1794 | Robert Goodloe Harper (P) | October 13–14, 1794 |
| 3rd | MD 3 | Uriah Forrest (P) | Resigned | Benjamin Edwards (P) | December 8, 1794 |
| 3rd | NJ at-large | Abraham Clark (Pro-Admin) | Died September 15, 1794 | Aaron Kitchell (Pro-Admin) | January 11, 1795 |
| 4th | SC 2 | John Barnwell[e] (F) | Declined to serve | Wade Hampton (DR) | January 19–20, 1795[d] |
| 4th | CT at-large | Jonathan Trumbull[e] (F) | Resigned | Nathaniel Smith (F) | April 13, 1795[d] |
| 4th | NC 4 | Alexander Mebane (DR) | Died July 5, 1795 | Absalom Tatom (DR) | August 13–14, 1795[d] |
| 4th | MD 2 | Gabriel Duvall (DR) | Resigned March 28, 1796 | Richard Sprigg (DR) | April 18, 1796[d] |
| 4th | MA 10 | Benjamin Goodhue (F) | Resigned | Samuel Sewall (F) | September 12, 1796[d] |
| 4th | CT at-large | James Hillhouse (F) | Elected U.S. Senator May 12, 1796; resigned in the fall of 1796 | James Davenport (F) | September 19, 1796[d] |
| 4th | MD 3 | Jeremiah Crabb (F) | Resigned in 1796 after June 1 | William Craik (F) | October 3, 1796[d] |
| 4th | PA 5 | Daniel Hiester (DR) | Resigned | George Ege (F) | October 11, 1796[d] |
| 4th | RI at-large | Benjamin Bourne (F) | Resigned in October 1796 | Elisha R. Potter (F) | November 15, 1796[d] |
| 4th | MA 1 | Theodore Sedgwick (F) | Resigned in early June 1796 | Thomson J. Skinner (DR) | November 21, 1796[d] |
| 4th | NC 4 | Absalom Tatom (DR) | Resigned June 1, 1796 | William Strudwick (F) | November 23, 1796[d] |
| 4th | CT at-large | Uriah Tracy (F) | Resigned October 13, 1796 | Samuel W. Dana (F) | December 5, 1796[d] |
| 5th | RI at-large | Benjamin Bourne (F) | Resigned in October 1796 | Elisha R. Potter (F) | November 15, 1796[d] |
| 5th | CT at-large | Uriah Tracy[e] (F)
Zephaniah Swift (F) | Declined to serve | John Allen (F)
James Davenport (F) | April 10, 1797[d] |
| 5th | VT 2 | Daniel Buck (F) | Declined to serve | Lewis R. Morris (F) | May 23, 1797[d] |
| 5th | MA 11 | Theophilus Bradbury (F) | Resigned July 24, 1797 | Bailey Bartlett (F) | August 4, 1797[d] |
| 5th | NH at-large | Jeremiah Smith (F) | Resigned | Peleg Sprague (F) | August 28, 1797 |
| 5th | RI at-large | Elisha R. Potter (F) | Resigned in July 1797 | Thomas Tillinghast (F) | August 29, 1797[d] |
| 5th | SC 1 | William L. Smith (F) | Resigned July 10, 1797 | Thomas Pinckney (F) | September 4–5, 1797[d] |
| 5th | CT at-large | James Davenport (F) | Died August 3, 1797.[3] | William Edmond (F) | September 18, 1797[d] |
| 5th | PA 5 | George Ege (F) | Resigned in October 1797 | Joseph Hiester (DR) | October 10, 1797[d] |
| 5th | NH at-large | Jeremiah Smith (F) | Resigned June 26, 1797 | Peleg Sprague (F) | October 30, 1797[d] |
| 5th | NC 10 | Nathan Bryan (DR) | Died June 4, 1798 | Richard D. Spaight (DR) | August 2, 1798[d] |
| 5th | PA 1 | John Swanwick (DR) | Died August 1, 1798 | Robert Waln (F) | October 9, 1798[d] |
| 5th | PA 4 | Samuel Sitgreaves (F) | Resigned in 1798 | Robert Brown (DR) | October 9, 1798[d] |
| 5th | CT at-large | Joshua Coit (F) | Died September 5, 1798 | Jonathan Brace (F) | October 22, 1798[d] |
| 5th | VA 9 | William B. Giles (DR) | Resigned October 2, 1798 | Joseph Eggleston (DR) | November 1, 1798[d] |
| 6th | MD 7 | Joshua Seney[e] (DR) | Died October 20, 1798 | Joseph H. Nicholson (DR) | November 29, 1798[d] |
| 6th | CT at-large | John Allen (F) | Declined to serve | Elizur Goodrich (F) | September 16, 1799[d] |
| 6th | NH at-large | Peleg Sprague (F) | Declined to serve | James Sheafe (F) | November 18, 1799[d] |
| 6th | NY 1 | Jonathan N. Havens (DR) | Died October 25, 1799 | John Smith (DR) | December 27–29, 1799[d] |
| 6th | VA 13 | John Marshall (F) | Resigned | Littleton W. Tazewell (DR) | June 7, 1800 |
| 6th | NH at-large | William Gordon (F) | Resigned | Samuel Tenney (F) | August 25, 1800 |
| 6th | CT at-large | Jonathan Brace (F) | Resigned in May 1800 | John C. Smith (F) | September 15, 1800[d] |
| 6th | MA 10 | Samuel Sewall (F) | Resigned January 10, 1800 | Nathan Read (F) | October 20, 1800[d] |
| 6th | NH at-large | William Gordon (F) | Resigned | Samuel Tenney (F) | October 27, 1800[d] |
| 6th | MA 3 | Samuel Lyman (F) | Resigned November 6, 1800 | Ebenezer Mattoon (F) | December 15, 1800[d] |
| 6th | MA 4 | Dwight Foster (F) | Resigned | Levi Lincoln (DR) | December 15, 1800[d][f] |
| 6th | PA 8 | Thomas Hartley (F) | Died December 21, 1800 | John Stewart (DR) | January 15, 1801[d][f] |
| 7th | GA at-large | James Jones[e] (DR) | Died January 11, 1801 | John Milledge (DR) | March 23, 1801[d] |
| 7th | CT at-large | Elizur Goodrich[e] (F) | Resigned | Calvin Goddard (F) | April 9, 1801[d] |
| 7th | MA 14 | George Thatcher[c] (F) | Declined to seek re-election | Richard Cutts (DR) | June 22, 1801[d] |
| 7th | NC 8 | David Stone[e] (DR) | Resigned | Charles Johnson (DR) | August 6–7, 1801[d] |
| 7th | MA 4 | Levi Lincoln (DR) | Declined to serve | Seth Hastings (F) | June 22, 1801[d] |
| 7th | MA 14 | George Thatcher (F) | Declined to serve | Richard Cutts (DR) | June 22, 1801 |
| 7th | CT at-large | William Edmond[c] (F) | Declined to serve | Benjamin Tallmadge (F) | September 21, 1801[d] |
| 7th | MA 12 | Silas Lee (F) | Resigned | Vacant | September 25, 1801 |
| 7th | NC 8 | David Stone (F) | Resigned before the start of the 7th Congress | Charles Johnson (DR) | August 6, 1801 |
| 7th | NY 5 | Thomas Tillotson[c] (DR) | Resigned | Theodorus Bailey (DR) | October 6–8, 1801[d] |
| 7th | NY 6 | John Bird[c] (F) | Resigned July 25, 1801 | John P. Van Ness (DR) | October 6–8, 1801[d] |
| 7th | PA 4 | Peter Muhlenberg (DR) | Declined to serve | Isaac Van Horne (DR) | October 13, 1801[d] |
| 7th | PA 12 | Albert Gallatin (DR) | Declined to serve | William Hoge (DR) | October 13, 1801[d] |
| 7th | TN at-large | William C. C. Claiborne[c] (DR) | Resigned | William Dickson (DR) | October 29–30, 1801[d] |
| 7th | MD 2 | Richard Sprigg (DR) | Resigned April 11, 1802 | Walter Bowie (DR) | March 2, 1802[d] |
| 7th | GA at-large | Benjamin Taliaferro (DR) | Resigned | David Meriwether (DR) | April 5, 1802[d] |
| 7th | SC 4 | Thomas Sumter (DR) | Resigned | Richard Winn (DR) | April 12–13, 1802[d] |
| 7th | MA 12 | None | Failure to elect | Samuel Thatcher (F) | July 29, 1802[d] |
| 7th | NH at-large | Joseph Peirce (F) | Resigned | Samuel Hunt (F) | August 30, 1802[d] |
| 7th | NC 8 | Charles Johnson (DR) | Died July 23, 1802 | Thomas Wynns (DR) | October 15, 1802[d] |
| 8th | NY 7 | John Cantine[e] (F) | Declined to serve | Josiah Hasbrouck (DR) | April 26–28, 1803[d] |
| 8th | CT at-large | Elias Perkins[c] (F) | Declined to serve | Simeon Baldwin (F) | September 5, 1803[d] |
| 8th | NY 6 | Isaac Bloom[c] (DR) | Died | Daniel C. Verplanck (DR) | September 14–16, 1803[d] |
| 8th | GA at-large | John Milledge[e] (DR) | Milledge was elected Governor of Georgia | Joseph Bryan (DR) | October 3, 1803[d] |
| 8th | NY 1 | John Smith (DR) | Resigned | Samuel Riker (DR) | April 24–26, 1804[d] |
| 9th | NY 2 | Daniel D. Tompkins[e] (DR) | Declined to serve | Gurdon S. Mumford (DR) | September 11–13, 1804[d] |
| 8th | MA 12 | Thomson J. Skinner (DR) | Resigned | Simon Larned (DR) | September 17, 1804[d] |
| 8th | PA 10 | William Hoge (DR) | Resigned October 15, 1804 | John Hoge (DR) | November 2, 1804[d][f] |
| 8th | VA 13 | John Johns Trigg (DR) | Died | Christopher H. Clark (DR) | October 1804[d] |
| 8th | MD 4 | Daniel Hiester (DR) | Died | Roger Nelson (DR) | October 1, 1804[d] |
| 8th | VA 5 | Andrew Moore (DR) | Resigned | Alexander Wilson (DR) | November 13, 1804[d] |
| 8th | NY 3 | Samuel L. Mitchill (DR) | Resigned | George Clinton (DR) | January 2–4, 1805[d] |
| 9th | SC 8 | John B. Earle[c] (DR) | Declined to serve | Elias Earle (DR) | September 26–27, 1805[d] |
| 9th | NC 5 | James Gillespie[e] (DR) | Died | Thomas Kenan (DR) | August 8, 1805[d] |
| 9th | CT at-large | Calvin Goddard[c] (F) | Declined to serve | Timothy Pitkin (F) | September 16, 1805[d][f] |
| Roger Griswold[c] (F) | Declined to serve | Lewis B. Sturges (F) |
| 9th | DE at-large | James A. Bayard (F) | Declined to serve | James M. Broom (F) | October 1, 1805[d] |
| 9th | PA 4 | John A. Hanna (DR) | Died July 23, 1805 | Robert Whitehill (DR) | October 8, 1805[d] |
| 9th | PA 11 | John B. Lucas (DR) | Declined to serve | Samuel Smith (DR) | October 8, 1805[d] |
| 9th | NC 10 | Nathaniel Alexander[c] (DR) | Resigned | Evan S. Alexander (DR) | January 23–24, 1806[d] |
| 9th | GA at-large | Joseph Bryan (DR) | Resigned | Dennis Smelt (DR) | September 1, 1806[d][f] |
| 9th | CT at-large | John C. Smith (F) | Resigned | Theodore Dwight (F) | September 15, 1806[d] |
| 9th | MD 7 | Joseph H. Nicholson (DR) | Resigned | Edward Lloyd (DR) | September 27/October 4, 1806[d] |
| 9th | VA 13 | Christopher H. Clark (DR) | Resigned | William A. Burwell (DR) | November 1806[d] |
| 9th | PA 1 | Michael Leib (DR) | Resigned | John Porter (DR) | November 27, 1806[d] |
| 9th | GA at-large | Thomas Spalding (DR) | Resigned | William W. Bibb (DR) | December 1, 1806[d] |
| 10th | SC 6 | Levi Casey[e] (DR) | Died | Joseph C. Calhoun (DR) | June 1–2, 1807[d] |
| 10th | MA 12 | Barnabas Bidwell[c] (DR) | Resigned | Ezekiel Bacon (DR) | July 13, 1807[d] |
| 10th | DE at-large | James M. Broom (F) | Declined to serve | Nicholas Van Dyke (F) | October 6, 1807[d] |
| 10th | NC 7 | John Culpepper (F) | Seat declared vacant from January to February 1808 | John Culpepper (F) | February 1, 1808[d] |
| 10th | NJ at-large | Ezra Darby (DR) | Died | Adam Boyd (DR) | March 8–9, 1808[d] |
| 10th | NY 12 | David Thomas (DR) | Resigned | Nathan Wilson (DR) | April 26–28, 1808[d] |
| 10th | MA 2 | Jacob Crowninshield (DR) | Died | Joseph Story (DR) | May 4, 1808[d] |
| 10th | RI at-large | Nehemiah Knight (DR) | Died | Richard Jackson Jr. (F) | August 30, 1808[d] |
| 10th | VT 1 | James Witherell (DR) | Resigned | Samuel Shaw (DR) | September 6, 1808[d][f] |
| 10th | VA 17 | John Claiborne (DR) | Died | Thomas Gholson Jr. (DR) | September 8, 12, 26, 1808[d] |
| 10th | PA 1 | Joseph Clay (DR) | Resigned after March 28, 1808 | Benjamin Say (DR) | October 11, 1808[d] |
| 11th | PA 1 | Benjamin Say (DR) | Resigned in June 1809 | Adam Seybert (DR) | October 10, 1809[d][f] |
| 11th | VA 21 | Wilson C. Nicholas (DR) | Resigned | David S. Garland (DR) | December 1809[d] |
| 11th | NY 2 | William Denning[c] (DR) | Resigned | Samuel L. Mitchill (DR) | April 24–26, 1810[d] |
| 11th | KY 5 | Benjamin Howa (DR) | Resigned | William T. Barry (DR) | August 6, 1810[d] |
| 11th | CT at-large | Samuel W. Dana (F) | Resigned | Ebenezer Huntington (F) | September 17, 1810[d] |
| 11th | MD 4 | Roger Nelson (DR) | Resigned | Samuel Ringgold (DR) | October 1, 1810[d] |
| 11th | NJ at-large | James Cox (DR) | Died | John A. Scudder (DR) | October 30–31, 1810[d] |
| 11th | MA 10 | Jabez Upham (F) | Resigned | Joseph Allen (F) | October 8, 1810[d][f] |
| 11th | MA 11 | William Stedman (F) | Resigned | Abijah Bigelow (F) | October 8, 1810[d][f] |
| 11th | VA 1 | John G. Jackson (DR) | Resigned | William McKinley (DR) | November 1810[d] |
| 11th | MD 7 | John Brown (DR) | Resigned | Robert Wright (DR) | November 15, 1810[d] |
| 11th | SC 1 | Robert Marion (DR) | Resigned | Langdon Cheves (DR) | December 31, 1810[d][f] |
| 12th | MD 7 | John Brown[e] (DR) | Resigned before the close of the previous Congress | Robert Wright (DR) | November 15, 1810[d][g] |
| 12th | MD 6 | John Montgomery[c] (DR) | Resigned | Stevenson Archer (DR) | October 2, 1811[d] |
| 12th | MA 4 | Joseph B. Varnum[c] (DR) | Resigned | William M. Richardson (DR) | November 4, 1811[d][f] |
| 12th | MA 17 | Barzillai Gannett[c] (DR) | Resigned | Francis Carr (DR) | April 6, 1812[d][f] |
| 12th | GA at-large | Howell Cobb (DR) | Resigned before October 1812 | William Barnett (DR) | October 5, 1812[d][f] |
| 12th | NY 6 | Robert L. Livingston (F) | Resigned | Thomas P. Grosvenor (F) | December 15–17, 1812[d] |
| 12th | NC 3 | Thomas Blount (DR) | Died February 7, 1812 | William Kennedy (DR) | January 11, 1813[d] |
| 13th | PA 13 | John Smilie[e] (DR) | Died December 30, 1812 | Isaac Griffin (DR) | February 16, 1813[d] |
| 13th | OH 6 | John S. Edwards[e] (F) | Died | Reasin Beall (DR) | April 20, 1813[d] |
| 13th | NY 15 | William Dowse[e] (F) | Died | John M. Bowers[h] (F) | April 27–29, 1813[d] |
| 13th | KY 8 | John Simpson[e] (DR) | Died January 22, 1813 | Stephen Ormsby (DR) | April 29, 1813[d] |
| 13th | PA 15 | Abner Lacock[e] (DR) | Resigned March 3, 1813 | Thomas Wilson (DR) | May 4, 1813[d][f] |
| 13th | OH 3 | Duncan McArthur[c] (DR) | Declined to serve | William Creighton (DR) | May 10, 1813[d] |
| 13th | PA 5 | Robert Whitehill (DR) | Died April 8, 1813 | John Rea (DR) | May 11, 1813[d][f] |
| 13th | PA 3 | John Gloninger (F) | Resigned August 2, 1813 | Edward Crouch (DR) | October 12, 1813[d][f] |
| 13th | PA 7 | John M. Hyneman (DR) | Resigned August 2, 1813 | Daniel Udree (DR) | October 12, 1813[d][f] |
| 13th | GA at-large | William W. Bibb (DR) | Resigned | Alfred Cuthbert (DR) | December 13, 1813[d][f] |
| 13th | NY 2 | Egbert Benson (F) | Resigned | William Irving (DR) | December 28–30, 1813[d] |
| 13th | KY 2 | Henry Clay (DR) | Resigned | Joseph H. Hawkins (DR) | February 28, 1814[d] |
| 13th | MA 4 | William M. Richardson (DR) | Resigned | Samuel Dana (DR) | May 23, 1814[d] |
| 13th | VA 11 | John Dawson (DR) | Died | Philip P. Barbour (DR) | June 1814[d] |
| 13th | MA 12 | Daniel Dewey (F) | Resigned | John W. Hulbert (F) | August 4, 1814[d] |
| 13th | NH at-large | Samuel Smith (F) | Failure to elect.[i] | Vacant | August 29, 1814[d] |
| 13th | TN 5 | Felix Grundy (DR) | Resigned | Newton Cannon (DR) | September 15–16, 1814[d] |
| 13th | NJ 3 | Jacob Hufty [j] (F) | Died May 20, 1814 | Thomas Bines (DR) | October 10–11, 1814[d] |
| 13th | OH 6 | Reasin Beall (DR) | Resigned June 7, 1814 | David Clendenin (DR) | October 11, 1814[d][f] |
| 13th | PA 2 | Jonathan Roberts (DR) | Resigned February 24, 1814 | Samuel Henderson (F) | October 11, 1814[d][f] |
| 13th | PA 3 | James Whitehill (DR) | Resigned September 1, 1814 | Amos Slaymaker (F) | October 12, 1814[d][f] |
| 14th | NY 6 | Jonathan Fisk (DR) | Resigned | James W. Wilkin (DR) | April 1815 |
| 14th | NY 12 | Benjamin Pond (DR) | Died October 14, 1814 | Asa Adgate (DR) | April 1815 |
| 14th | VA 15 | Matthew Clay (DR) | Died May 27, 1815 | John Kerr (DR) | October 1815 |
| 14th | PA 1 | Jonathan Williams (DR) | Died May 16, 1815 | John Sergeant (F) | October 10, 1815 |
| 14th | PA 3 | Amos Ellmaker (DR) | Resigned July 3, 1815 | James M. Wallace (DR) | October 10, 1815 |
| 14th | PA 9 | David Bard (DR) | Died March 12, 1815 | Thomas Burnside (DR) | October 10, 1815 |
| 14th | TN 2 | John Sevier (DR) | Died September 24, 1815 | William G. Blount (DR) | December 7–8, 1815 |
| 14th | NC 6 | Nathaniel Macon (DR) | Resigned | Weldon N. Edwards (DR) | January 22, 1816 |
| 14th | MD 5 | Nicholas R. Moore (DR) | Resigned in 1815 | Samuel Smith (DR) | January 27, 1816 |
| 14th | NY 20 | Enos T. Throop (DR) | Resigned | Daniel Avery (DR) | September 1816 |
| 14th | MD 5 | William Pinkney (DR) | Pinkney was named Minister to Russia | Peter Little (DR) | September 3, 1816 |
| 14th | PA 9 | Thomas Burnside (DR) | Resigned in April 1816 | William P. Maclay (DR) | October 8, 1816 |
| 14th | VA 18 | Thomas Gholson Jr. (DR) | Died July 4, 1816 | Thomas M. Nelson (DR) | October 10–28, 1816 |
| 14th | KY 1 | James Clark (DR) | Resigned | Thomas Fletcher (DR) | December 2, 1816 |
| 14th | MD 3 | Alexander C. Hanson (F) | Resigned | George Peter (F) | December 2, 1816 |
| 14th | MA 11 | Elijah Brigham (F) | Died | Benjamin Adams (F) | December 2, 1816 |
| 14th | NC 8 | Richard Stanford (DR) | Died April 16, 1816 | Samuel Dickens (DR) | December 2, 1816 |
| 14th | OH 1 | John McLean (DR) | Resigned in April 1816 | William Henry Harrison (DR) | October 8, 1816 |
| 14th | GA at-large | Alfred Cuthbert (DR) | Resigned | Zadock Cook (DR) | December 1816 |
| 15th | PA 10 | David Scott (DR) | Resigned | John Murray (DR) | October 14, 1817 |
| 15th | CT at-large | Sylvanus Blackus (F)
Charles Dennison (F) | Died February 15, 1817 | Ebenezer Huntington (F)
Nathaniel Terry (F) | December 1, 1817 |
| 15th | NY 4 | Henry B. Lee (DR) | Died February 18, 1817 | James Tallmadge Jr. (DR) | December 1, 1817 |
| 15th | NC 7 | Alexander McMillan (F) | Died | James Stewart (F) | January 1, 1818 |
| 15th | SC 6 | John C. Calhoun (DR) | Resigned | Eldred Simkins (DR) | February 9, 1818 |
| 15th | PA 6 | John Ross (DR) | Resigned February 24, 1818 | Thomas J. Rogers (DR) | March 3, 1818 |
| 15th | PA 6 | Samuel D. Ingham (DR) | Resigned July 6, 1818 | Samuel Moore (DR) | October 13, 1818 |
| 15th | MA 20 | Albion Parris (DR) | Resigned | Enoch Lincoln (DR) | November 4, 1818 |
| 15th | NC 11 | Daniel M. Forney (DR) | Resigned | William Davidson (F) | November 7, 1818 |
| 15th | CT at-large | Uriel Holmes (F) | Resigned | Sylvester Gilbert (DR) | November 16, 1818 |
| 15th | PA 4 | Jacob Spangler (DR) | Resigned April 20, 1818 | Jacob Hostetter (DR) | November 16, 1818 |
| 15th | LA at-large | Thomas B. Robertson (DR) | Resigned | Thomas Butler (DR) | November 16, 1818 |
| 15th | VA 19 | Peterson Goodwyn (DR) | Died February 21, 1818 | John Pegram (DR) | November 16, 1818 |
| 15th | GA at-large | John Forsyth (DR) | Resigned | Robert R. Reid (DR) | January 4, 1819 |
| 16th | GA at-large | John Forsyth (DR) | Resigned | Robert R. Reid (DR) | January 4, 1819 |
| 16th | NJ at-large | John Condit (DR) | Resigned November 4, 1819 | Charles Kinsey (DR) | February 1–2, 1820 |
| 16th | MA 13 | Edward Dowse (DR) | Resigned | William Eustis (DR) | August 21, 1820 |
| 16th | PA 5 | David Fullerton (DR) | Resigned May 15, 1820 | Thomas G. McCullough (F) | October 10, 1820 |
| 16th | ME 1 | John Holmes (DR) | Resigned | Joseph Dane (F) | November 7, 1820 |
| 16th | VA 1 | James Pindall (F) | Resigned | Edward B. Jackson (DR) | November 13, 1820 |
| 16th | VA 10 | George F. Strother (DR) | Resigned | Thomas L. Moore (DR) | November 13, 1820 |
| 16th | VA 20 | James Johnson (DR) | Resigned | John C. Gray (DR) | November 13, 1820 |
| 16th | PA 7 | Joseph Hiester (DR) | Resigned in December 1820 | Daniel Udree (DR) | December 26, 1820 |
| 16th | NC 4 | Jesse Slocumb (DR) | Died December 20, 1820 | William S. Blackledge (DR) | February 7, 1821 |
| 17th | NJ at-large | John Linn (DR) | Died January 5, 1821 | Lewis Condict (DR) | October 8–9, 1821 |
| 17th | OH 4 | John C. Wright (DR) | Resigned March 3, 1821 | David Chambers (DR) | October 9, 1821 |
| 17th | PA 5 | James Duncan (DR) | Resigned in April 1821 | John Findlay (DR) | October 9, 1821 |
| 17th | PA 10 | William Cox Ellis (F) | Resigned July 20, 1821 | Thomas Murray Jr. (DR) | October 9, 1821 |
| 17th | NY 6 | Selah Tuthill (DR) | Died September 7, 1821 | Charles Borland Jr. (DR) | November 6–8, 1821 |
| 17th | SC 9 | John S. Richards (DR) | Declined to serve | James Blair (DR) | December 3, 1821 |
| 17th | KY 8 | Wingfield Bullock (DR) | Died October 13, 1821 | James D. Breckinridge (DR) | January 2, 1822 |
| 17th | NY 9 | Solomon Van Rensselaer (DR) | Resigned | Stephen Van Rensselaer (F) | February 25–27, 1822 |
| 17th | DE at-large | Caesar A. Rodney (DR) | Resigned January 24, 1822 | Daniel Rodney (F) | October 1, 1822 |
| 17th | PA 1 | William Milnor (F) | Resigned May 8, 1822 | Thomas Forrest (F) | October 1, 1822 |
| 17th | PA 6 | Samuel Moore (DR) | Resigned May 20, 1822 | Samuel D. Ingham (DR) | October 1, 1822 |
| 17th | PA 14 | Henry Baldwin (DR) | Died May 8, 1822 | Walter Forward (DR) | October 1, 1822 |
| 17th | IN at-large | William Hendricks (DR) | Resigned | Jonathan Jennings (DR) | December 2, 1822 |
| 17th | ME 2 | Ezekiel Whitman (F) | Resigned June 1, 1822 | Mark Harris (DR) | December 2, 1822 |
| 17th | PA 7 | Ludwig Worman (F) | Died October 17, 1822 | Daniel Udree (F) | December 10, 1822 |
| 17th | SC 9 | James Blair (DR) | Resigned | John Carter (DR) | December 11, 1822 |
| 17th | SC 2 | William Lowndes (DR) | Resigned May 8, 1822 | James Hamilton Jr. (DR) | January 6, 1823 |
| 17th | MD 5 | Samuel Smith (DR) | Resigned December 22, 1822 | Isaac McKim (DR) | January 8, 1823 |
| 18th | MD 5 | Samuel Smith (DR) | Resigned December 22, 1822 | Isaac McKim (Jackson DR) | January 8, 1823 |
| 18th | NY 28 | William B. Rochester (Adams DR) | Resigned | William Woods (Adams DR) | December 1, 1823 |
| 18th | VA 13 | William Lee Ball (Crawford DR) | Died February 29, 1824 | John Taliaferro (Crawford DR) | April 8, 1824[k] |
| 18th | PA 8 | Thomas J. Rogers (Jackson DR) | Resigned April 20, 1824 | George Wolf (Jackson DR) | October 12, 1824 |
| 18th | PA 13 | John Tod (Jackson DR) | Resigned | Alexander Thomson (Jackson DR) | October 12, 1824 |
| 18th | MA 10 | None[l] | (See note) | John Bailey (DR) | December 13, 1824 |
| 18th | VT at-large | Charles Rich (DR) | Died October 15, 1824 | Henry Olin (DR) | December 13, 1824[f] |
| 18th | IN 1 | William Prince (DR) | Died September 8, 1824 | Jacob Call (Jackson DR) | December 23, 1824[f] |
| 18th | NC 2 | Hutchins Gordon Burton (Crawford DR) | Resigned | George Outlaw (Crawford DR) | January 6, 1825 |
| 18th | GA at-large | Thomas W. Cobb (Crawford DR) | Resigned | Richard Henry Wilde (Crawford DR) | February 7, 1825 |
| 19th | PA 16 | James Allison Jr. (J) | Resigned | Robert Orr Jr. (J) | October 11, 1825 |
| 19th | PA 18 | Patrick Farrelly (J) | Died January 12, 1826 | Thomas H. Sill (NR) | March 14, 1826 |
| 19th | ME 5 | Enoch Lincoln (DR) | Resigned | James W. Ripley (J) | September 11, 1826 |
| 19th | OH 10 | David Jennings (NR) | Resigned May 25, 1826 | Thomas Shannon (NR) | October 10, 1826 |
| 19th | PA 2 | Joseph Hemphill (J) | Resigned May 1, 1826 | Thomas Kittera (NR) | October 10, 1826 |
| 19th | PA 7 | Henry Wilson (J) | Died August 14, 1826 | Jacob Krebs (J) | October 10, 1826 |
| 19th | PA 13 | Alexander Thomson (J) | Resigned May 1, 1826 | Chauncey Forward (J) | October 10, 1826 |
| 20th | ME 1 | William Burleigh (NR) | Died July 2, 1827 | Rufus McIntire (J) | September 10, 1827 |
| 20th | GA 1 | Edward Fenwick Tattnall[m] (J) | (See note) | George Rockingham Gilmer (J) | October 1, 1827 |
| 20th | DE at-large | Louis McLane (J) | Resigned | Kensey Johns Jr. (NR) | October 2, 1827 |
| 20th | OH 8 | William Wilson (NR) | Died June 6, 1827 | William Stanbery (J) | October 9, 1827 |
| 20th | PA 2 | None[n] | Previous election was tied | John Sergeant (NR) | October 9, 1827 |
| 20th | GA 2 | John Forsyth (J) | Resigned | Richard Henry Wilde (J) | November 17, 1827 |
| 20th | NJ at-large | George Holcombe (J) | Died January 4, 1828 | James F. Randolph (NR) | November 3–4, 1828 |
| 20th | NJ at-large | Hedge Thompson (NR) | Died July 23, 1828 | Thomas Sinnickson (NR) | November 3–4, 1828 |
| 20th | OH 6 | William Creighton (NR) | Resigned | Francis Swaine Muhlenberg (NR) | December 2, 1828 |
| 21st | ME 4 | Peleg Sprague (NR) | Resigned | George Evans (NR) | July 20, 1829 |
| 21st | PA 8 | Samuel D. Ingham (J)
George Wolf (J) | Ingham became U.S. Treasury Secretary March 6, 1829
Wolf was elected Governor of Pennsylvania | Peter Ihrie Jr. (J)
Samuel A. Smith (J) | October 13, 1829 |
| 21st | PA 16 | William Wilkins (J) | Resigned | Harmar Denny (Anti-M) | December 15, 1829 |
| 21st | OH 11 | John M. Goodenow (J) | Resigned April 9, 1830 | Humphrey H. Leavitt (J) | October 11, 1830 |
| 21st | ME 5 | James W. Ripley (J) | Resigned | Cornelius Holland (J) | December 6, 1830 |
| 22nd | VT 2 | Rollin Carolas Mallary (NR) | Died April 15, 1831 | William Slade (Anti-M) | November 1, 1831 |
| 22nd | PA 11 | William Ramsey (J) | Died September 29, 1831 | Robert McCoy (J) | November 22, 1831 |
| 22nd | VT 1 | Jonathan Hunt (NR) | Died May 15, 1832 | Hiland Hall (NR) | January 1, 1833 |
| 23rd | PA 1 | Joel B. Sutherland (J) | Resigned March 5, 1833 | Joel B. Sutherland (J)[o] | October 8, 1833 |
| 23rd | OH 19 | Humphrey H. Leavitt (J) | Resigned July 10, 1834 | Daniel Kilgore (J) | October 14, 1834 |
| 23rd | OH 1 | Robert T. Lytle (J) | Resigned March 10, 1834 | Robert T. Lytle (J) | November 8, 1834 |
| 23rd | VT 5 | Benjamin F. Deming (Anti-M) | Died July 11, 1834 | Henry Fisk Janes (Anti-M) | November 10, 1834 |
| 23rd | CT at-large
Seat A | William W. Ellsworth (NR) | Resigned July 8, 1834 | Joseph Trumbull (NR) | December 1, 1834 |
| 23rd | CT at-large
Seat B | Jabez W. Huntington (NR) | Resigned August 16, 1834 | Phineas Miner (NR) | December 1, 1834 |
| 23rd | CT at-large
Seat C | Samuel A. Foot (NR) | Resigned May 9, 1834 | Ebenezer Jackson Jr. (NR) | December 1, 1834 |
| 24th | PA 24 | John Banks (Anti-M) | Resigned April 2, 1836 | John J. Pearson (NR) | October 11, 1836 |
| 24th | PA 13 | Jesse Miller (J) | Resigned October 30, 1836 | James Black (J) | November 4, 1836 |
| 24th | NJ at-large | Philemon Dickerson (J) | Resigned November 3, 1836 | William Chetwood (W) | November 15–16, 1836 |
| 25th | PA 3 | Francis J. Harper (D) | Died March 18, 1837 | Charles Naylor (W) | June 29, 1837 |
| 25th | OH 17 | Andrew W. Loomis (W) | Resigned October 20, 1837 | Charles D. Coffin (W) | November 30, 1837 |
| 25th | PA 9 | Henry A. P. Muhlenberg (D) | Resigned February 9, 1838 | George M. Keim (D) | March 8, 1838 |
| 25th | ME 3 | Jonathan Cilley (D) | Killed February 24, 1838 | Edward Robinson (W) | April 28, 1838 |
| 25th | ME 5 | Timothy J. Carter (D) | Died March 14, 1838 | Virgil D. Parris (D) | May 29, 1838 |
| 25th | OH 16 | Elisha Whittlesey (W) | Resigned July 9, 1838 | Joshua Reed Giddings (W) | October 9, 1838 |
| 25th | OH 19 | Daniel Kilgore (D) | Resigned July 4, 1838 | Henry Swearingen (D) | November 5, 1838 |
| 26th | PA 14 | William W. Potter (D) | Died October 28, 1839 | George McCulloch (D) | November 20, 1839 |
| 26th | OH 4 | Thomas Corwin (W) | Resigned May 30, 1840 | Jeremiah Morrow (W) | October 13, 1840 |
| 26th | PA 22 | Richard Biddle (Anti-M) | Resigned May 13, 1840 | Henry M. Brackenridge (W) | October 13, 1840 |
| 26th | PA 13 | William S. Ramsey (D) | Died October 17, 1840 | Charles McClure (D) | November 20, 1840 |
| 27th | PA 13 | William S. Ramsey (D) | Died October 17, 1840 | Amos Gustine (D) | May 4, 1841 |
| 27th | PA 20 | Enos Hook (D) | Resigned April 18, 1841 | Henry W. Beeson (D) | May 25, 1841 |
| 27th | ME 4 | George Evans (W) | Resigned | David Bronson (W) | May 31, 1841 |
| 27th | PA 18 | Charles Ogle (W) | Died May 10, 1841 | Henry Black (W) | June 8, 1841 |
| 27th | PA 2 | John Sergeant (W) | Resigned September 15, 1841 | Joseph Reed Ingersoll (W) | October 12, 1841 |
| 27th | PA 18 | Henry Black (W) | Died November 28, 1841 | James M. Russell (W) | December 21, 1841 |
| 27th | PA 17 | Davis Dimock Jr. (D) | Died January 13, 1842 | Almon Heath Read (D) | March 1, 1842 |
| 27th | OH 16 | Joshua Reed Giddings (W) | Resigned March 22, 1842 | Joshua Reed Giddings (W) | April 26, 1842 |
| 27th | PA 21 | Joseph Lawrence (W) | Died April 17, 1842 | Thomas M. T. McKennan (W) | May 20, 1842 |
| 27th | MA 1 | Robert C. Winthrop (W) | Resigned | Nathan Appleton (W) | June 3, 1842 |
| Nathan Appleton (W) | Resigned September 28, 1842 | Robert C. Winthrop (W) | November 14, 1842 |
| 28th | PA 21 | William Wilkins (D) | Resigned February 14, 1844 | Cornelius Darragh (W) | March 15, 1844 |
| 28th | PA 13 | Henry Frick (W) | Died March 1, 1844 | James Pollock (W) | April 9, 1844 |
| 28th | OH 10 | Heman A. Moore (D) | Died April 3, 1844 | Alfred P. Stone (D) | October 8, 1844 |
| 28th | OH 21 | Henry R. Brinkerhoff (D) | Died April 30, 1844 | Edward S. Hamlin (D) | October 8, 1844 |
| 28th | PA 12 | Almon Heath Read (D) | Died June 3, 1844 | George Fuller (D) | October 8, 1844 |
| 29th | NJ 2 | Samuel G. Wright (W) | Died July 30, 1845 | George Sykes (D) | October 7–8, 1845 |
| 29th | FL at-large | David Levy Yulee (D) | Declined seat to become U.S. Senator from Florida | William Henry Brockenbrough (D) | October 6, 1845 |
| 29th | GA 3 | None[p] | (See note) | George W. Towns (D) | January 5, 1846 |
| 30th | OH 7 | Thomas L. Hamer (D) | Died December 2, 1846 | Jonathan D. Morris (D) | November 8, 1847 |
| 30th | PA 6 | John W. Hornbeck (W) | Died June 16, 1848 | Samuel A. Bridges (D) | February 23, 1848 |
| 31st | OH 6 | Rodolphus Dickinson (D) | Died March 20, 1849 | Amos E. Wood (D) | October 9, 1849 |
| 31st | VT 3 | George Perkins Marsh (W) | Resigned | James Meacham (W) | November 7, 1849 |
| 31st | GA 1 | Thomas Butler King (W) | Resigned | Joseph Webber Jackson (D) | February 4, 1850 |
| 31st | MA 1 | Robert C. Winthrop (W) | Resigned | Samuel A. Eliot (W) | August 22, 1850 |
| 31st | IA 1 | None | Seat declared vacant after contested election | Daniel F. Miller (W) | September 24, 1850 |
| 31st | NH 3 | James Wilson II (W) | Resigned September 9, 1850 | George W. Morrison (D) | October 8, 1850 |
| 31st | PA 15 | Henry Nes (W) | Died September 10, 1850 | Joel B. Danner (D) | October 8, 1850 |
| 31st | OH 6 | Amos E. Wood (D) | Died November 19, 1850 | John Bell (D) | December 23, 1850 |
| 31st | PA 11 | Chester P. Butler (W) | Died October 5, 1850 | John Brisbin (W) | December 31, 1850 |
| 32nd | ME 4 | Charles Andrews (D) | Died April 30, 1852 | Isaac Reed (W) | June 25, 1852 |
| 33rd | PA 8 | Henry A. Muhlenberg (D) | Died January 9, 1854 | J. Glancy Jones (D) | February 4, 1854 |
| 33rd | MA 1 | Zeno Scudder (W) | Declined to serve | Thomas D. Eliot (W) | April 17, 1854 |
| 34th | VT 1 | James Meacham (O) | Died August 23, 1856 | George Tisdale Hodges (R) | September 2, 1856 |
| 35th | PA 12 | John G. Montgomery (D) | Died April 24, 1857 | Paul Leidy (D) | October 13, 1857 |
| 35th | PA 8 | J. Glancy Jones (D) | Resigned October 30, 1858 | William H. Keim (R) | November 30, 1858 |
| 36th | OH 14 | Cyrus Spink (R) | Died May 31, 1859 | Harrison G. O. Blake (R) | October 11, 1859 |
| 36th | PA 8 | John Schwartz (ALD) | Died June 20, 1860 | Jacob K. McKenty (D) | October 9, 1860 |
| 36th | ME 5 | Israel Washburn Jr. (R) | Resigned January 1, 1861 | Stephen Coburn (R) | November 6, 1860 |
| 37th | OH 7 | Thomas Corwin (R) | Resigned March 12, 1861 | Richard A. Harrison (U) | May 28, 1861 |
| 37th | OH 13 | John Sherman (R) | Resigned March 21, 1861 | Samuel T. Worcester (R) | May 28, 1861 |
| 37th | PA 2 | Edward Joy Morris (R) | Resigned June 8, 1861 | Charles J. Biddle (UD) | June 21, 1861 |
| 37th | PA 12 | George W. Scranton (R) | Died March 24, 1861 | Hendrick Bradley Wright (UD) | June 21, 1861 |
| 37th | PA 7 | Thomas B. Cooper (D) | Died April 4, 1862 | John D. Stiles (D) | May 24, 1862 |
| 37th | ME 2 | Charles W. Walton (R) | Resigned | Thomas Fessenden (R) | December 1, 1862 |
| 38th | DE at-large | William Temple (D) | Died May 28, 1863 | Nathaniel B. Smithers (U) | November 19, 1863 |
| 40th | OH 2 | Rutherford B. Hayes (R) | Resigned July 20, 1867 | Samuel Fenton Cary (IR) | October 8, 1867 |
| 40th | PA 12 | Charles Denison (D) | Died June 27, 1867 | George W. Woodward (D) | October 8, 1867 |
| 40th | OH 8 | Cornelius S. Hamilton (R) | Killed December 22, 1867 | John Beatty (R) | January 27, 1868 |
| 40th | PA 9 | Thaddeus Stevens (R) | Died August 11, 1868 | Oliver J. Dickey (R) | October 13, 1868 |
| 40th | PA 20 | Darwin A. Finney (R) | Died August 25, 1868 | Solomon Newton Pettis (R) | October 13, 1868 |
| 41st | MA 7 | George S. Boutwell (R) | Resigned | George M. Brooks (R) | November 2, 1869 |
| 41st | OH 10 | Truman H. Hoag (D) | Died February 5, 1870 | Erasmus D. Peck (R) | April 5, 1870 |
| 41st | NC 4 | John T. Deweese (R) | Resigned | Robert B. Gilliam (D)[q] | August 4, 1870 |
| 41st | NC 4 | None | Died (see note above) | John Manning Jr. (D) | November 26, 1870 |
| 41st | SC 1 | Benjamin F. Whittemore (R) | Resigned | Joseph Rainey (R) | December 12, 1870 |
| 41st | GA 4 | Samuel F. Gove (R) | Elected, but not permitted to qualify | Jefferson F. Long (R) | December 22, 1870 |
| 42nd | OH 1 | Aaron F. Perry (R) | Resigned | Ozro J. Dodds (D) | October 8, 1872 |
| 42nd | GA 4 | Thomas J. Speer (R) | Died | Erasmus W. Beck (D) | October 29, 1872 |
| 42nd | PA 13 | Ulysses Mercur (R) | Resigned December 2, 1872 | Frank C. Bunnell (R) | December 24, 1872 |
| 43rd | OR 1 | Joseph G. Wilson (R) | Died July 2, 1873 | James Nesmith (D) | October 13, 1873 |
| 43rd | GA 8 | None[r] | (See note) | Alexander H. Stephens (D) | December 1, 1873 |
| 43rd | OR at-large | Joseph G. Wilson (R) | Died July 2, 1873 | James W. Nesmith (D) | December 1, 1873 |
| 43rd | OH 12 | Hugh J. Jewett (D) | Resigned June 23, 1874 | William E. Finck (D) | October 13, 1874 |
| 43rd | PA 23 | Ebenezer McJunkin (R) | Resigned January 1, 1875 | John M. Thompson (R) | November 3, 1874 |
| 44th | GA 9 | None[s] | (See note) | Benjamin Harvey Hill (D) | May 5, 1875 |
| 44th | ME 4 | Samuel F. Hersey (R) | Died February 3, 1875 | Harris M. Plaisted (R) | September 13, 1875 |
| 44th | OR at-large | None[t] | Died May 1, 1875 | Lafayette Lane (D) | October 25, 1875 |
| 44th | PA 12 | Winthrop W. Ketchum (R) | Resigned July 19, 1876 | William H. Stanton (D) | November 7, 1876 |
| 44th | ME 3 | James G. Blaine (R) | Resigned July 10, 1876 | Edwin Flye (R) | December 4, 1876 |
| 45th | GA 9 | None | Benjamin Harvey Hill (D) resigned | Hiram Parks Bell (D) | April 13, 1877 |
| 45th | NE at-large | Frank Welch (R) | Died September 4, 1878 | Thomas Jefferson Majors (R) | November 5, 1878 |
| 46th | GA 1 | Julian Hartridge (D) | Died January 8, 1879 | William Bennett Fleming (D) | February 10, 1879 |
| 46th | OH 19 | James A. Garfield (R) | Resigned November 8, 1880 | Ezra B. Taylor (R) | November 30, 1880 |
| 46th | NH 3 | Evarts Worcester Farr (R) | Died November 30, 1880. (Winner elected to finish term) | Ossian Ray (R) | December 28, 1880 |
| 47th | NH 3 | Evarts Worcester Farr (R) | Died November 30, 1880. (Winner elected to next term) | Ossian Ray (R) | December 28, 1880 |
| 47th | ME 2 | William P. Frye (R) | Resigned | Nelson Dingley Jr. (R) | September 12, 1881 |
| 47th | RI 1 | Nelson W. Aldrich (R) | Resigned | Henry J. Spooner (R) | November 22, 1881 |
| 47th | GA 8 | Alexander H. Stephens (D) | Resigned | Seaborn Reese (D) | November 8, 1882 |
| 47th | UT at-large | George Q. Cannon (R) | Seat declared vacant | John Thomas Caine (D) | November 8, 1882 |
| 47th | OH 16 | Jonathan T. Updegraff (R) | Died November 30, 1882 | Joseph D. Taylor (R) | January 2, 1883 |
| 48th | OH 17 | Jonathan T. Updegraff (R) | Died November 30, 1882 | Joseph D. Taylor (R) | January 2, 1883 |
| 48th | WV 3 | John E. Kenna (D) | Resigned | Charles P. Snyder (D) | May 15, 1883 |
| 48th | PA 19 | William A. Duncan (D) | Died November 14, 1884 | John A. Swope (D) | December 23, 1884 |
| 48th | RI 2 | Jonathan Chace (R) | Resigned | Nathan F. Dixon III (R) | February 5, 1885 |
| 49th | PA 19 | William A. Duncan (D) | Died November 14, 1884 | John A. Swope (D) | November 3, 1885 |
| 49th | RI 2 | William A. Pirce (R) | Candidate disqualified | Charles H. Page (D) | February 21, 1887 |
| 50th | NE 2 | James Laird (R) | Died August 17, 1889 | Gilbert L. Laws (R) | November 5, 1889 |
| 51st | PA 4 | William D. Kelley (R) | Died January 9, 1890 | John E. Reyburn (R) | February 18, 1890 |
| 51st | PA 3 | Samuel J. Randall (D) | Died April 13, 1890 | Richard Vaux (D) | May 20, 1890 |
| 52nd | SD at-large | John Rankin Gamble (R) | Died August 14, 1891 | John L. Jolley (R) | November 3, 1891 |
| 51st | AR 2 | John M. Clayton (R) | Was assassinated while contest was pending | Clifton R. Breckinridge (D) | November 4, 1890 |
| 51st | PA 27 | Lewis F. Watson (R) | Died August 25, 1890 | Charles W. Stone (R) | November 4, 1890 |
| 52nd | CA 3 | Joseph McKenna (R) | Resigned | Samuel G. Hilborn (R) | November 8, 1892 |
| 52nd | OH 16 | John G. Warwick (D) | Died August 14, 1892 | Lewis P. Ohliger (D) | November 8, 1892 |
| 52nd | PA 24 | Alexander K. Craig (D) | Died July 29, 1892 | William A. Sipe (D) | November 8, 1892 |
| 53rd | RI 2 | None | Failure to elect | Charles H. Page (D) | April 5, 1893 |
| 53rd | PA 8 | William Mutchler (D) | Died June 23, 1893 | Howard Mutchler (D) | August 7, 1893 |
| 53rd | MI 1 | J. Logan Chipman (D) | Died August 17, 1893 | Levi T. Griffin (D) | August 17, 1893 |
| 53rd | WI 4 | John L. Mitchell (D) | Declined to serve | Peter J. Somers (D) | August 27, 1893 |
| 53rd | OH 10 | William H. Enochs (R) | Died July 13, 1893 | Hezekiah S. Bundy (R) | November 5, 1893 |
| 53rd | PA 2 | Charles O'Neill (R) | Died November 25, 1893 | Robert Adams Jr. (R) | December 19, 1893 |
| 53rd | NY 14 | John R. Fellows (D) | Resigned | Lemuel E. Quigg (R) | January 30, 1894 |
| 53rd | VA 7 | Charles T. O'Ferrall (D) | Resigned | Smith S. Turner (D) | January 30, 1894 |
| 53rd | PA at-large | William Lilly (R) | Died December 1, 1893 | Galusha A. Grow (R) | January 20 or February 20, 1894 |
| 53rd | OH 3 | George W. Houk (D) | Died February 9, 1894 | Paul J. Sorg (D) | May 1, 1894 |
| 53rd | SC 1 | William H. Brawley (D) | Resigned | James F. Izlar (D) | February 12, 1894 |
| 53rd | LA 4 | Newton C. Blanchard (D) | Resigned | Henry W. Ogden (D) | March 12, 1894 |
| 53rd | MO 11 | Charles F. Joy (R) | Lost contested election | John J. O'Neill (D) | April 3, 1894 |
| 53rd | CA 3 | Samuel G. Hilborn (R) | Lost contested election | Warren B. English (D) | April 4, 1894 |
| 53rd | MD 1 | Robert F. Brattan (D) | Died | W. Laird Henry (D) | May 10, 1894 |
| 53rd | MD 5 | Barnes Compton (D) | Resigned | Charles E. Coffin (R) | May 15, 1894 |
| 53rd | KY 10 | Marcus C. Lisle (D) | Died July 7, 1894 | William M. Beckner (D) | July 7, 1894 |
| 53rd | KS 2 | Edward H. Funston (R) | Lost contested election | Horace L. Moore (D) | August 2, 1894 |
| 53rd | WI 7 | George B. Shaw (R) | Died August 27, 1894 | Michael Griffin (R) | August 27, 1894 |
| 53rd | AR 2 | Clifton R. Breckinridge (D) | Resigned | John S. Little (D) | November 1, 1894 |
| 53rd | OH 2 | John A. Caldwell (R) | Resigned May 4, 1894 | Jacob H. Bromwell (R) | November 6, 1894 |
| 53rd | AL 3 | William C. Oates (D) | Resigned | George P. Harrison (D) | November 30, 1894 |
| 53rd | NY 15 | Ashbel P. Fitch (D) | Resigned | Isidor Straus (D) | December 30, 1894 |
| 53rd | KY 9 | Thomas H. Paynter (D) | Resigned | Vacant | January 5, 1895 |
| 53rd | IL 10 | Philip S. Post (R) | Died January 6, 1895 | George W. Prince (R) | December 2, 1895 |
| 53rd | MI 3 | Julius C. Burrows (R) | Resigned | Vacant | January 13, 1895 |
| 53rd | PA 15 | Myron B. Wright (R) | Died November 13, 1894 | Edwin J. Jorden (R) | February 19, 1895 |
| 54th | PA 15 | Myron B. Wright (R) | Died November 13, 1894 | James H. Codding (R) | February 19, 1895 |
| 54th | GA 10 | James C. C. Black (D) | Succeeded himself to fill a vacancy he caused[5] | James C. C. Black (D) | October 2, 1895 |
| 54th | MA 6 | William Cogswell (R) | Died May 22, 1895 | William Henry Moody (R) | November 5, 1895 |
| 54th | NY 10 | None | Representative-elect Andrew J. Campbell (R) died December 6, 1894 | Amos J. Cummings (D) | November 5, 1895 |
| 54th | IL 10 | None | Philip S. Post (R) died January 6, 1895 | George W. Prince (R) | December 2, 1895 |
| 54th | IL 18 | Frederick Remann (R) | Died July 14, 1895 | William F. L. Hadley (R) | December 2, 1895 |
| 54th | MI 3 | Julius C. Burrows (R) | Resigned | Alfred Milnes (R) | December 2, 1895 |
| 54th | IL 3 | Lawrence E. McGann (D) | Lost election contest | Hugh R. Belknap (R) | December 27, 1895 |
| 54th | TX 11 | William H. Crain (D) | Died February 10, 1896 | Rudolph Kleberg (D) | April 7, 1896 |
| 54th | MO 5 | John C. Tarsney (D) | Lost election contest | Robert T. Van Horn (R) | February 27, 1896 |
| 54th | AL 4 | Gaston A. Robbins (D) | Lost election contest | William F. Aldrich (R) | March 12, 1896 |
| 54th | VA 5 | William R. McKenney (D) | Lost election contest | Robert T. Thorp (R) | May 2, 1896 |
| 54th | AL 5 | James E. Cobb (D) | Lost election contest | Albert T. Goodwyn (P) | April 21, 1896 |
| 54th | SC 7 | None | Seat declared vacant | J. William Stokes (D) | June 1, 1896 |
| 54th | NY 8 | James J. Walsh (D) | Lost election contest | John M. Mitchell (R) | June 2, 1896 |
| 54th | SC 1 | William Elliott (D) | Lost election contest | George W. Murray (R) | June 4, 1896 |
| 54th | IL 16 | Finis E. Downing (D) | Lost election contest | John I. Rinaker (R) | June 5, 1896 |
| 54th | NC 6 | James A. Lockhart (D) | Lost election contest | Charles H. Martin (P) | June 5, 1896 |
| 54th | AL 9 | Oscar W. Underwood (D) | Lost election contest | Truman H. Aldrich (R) | June 9, 1896 |
| 54th | LA 5 | None | Seat declared vacant after contested election | Charles J. Boatner (D) | June 10, 1896 |
| 54th | GA 3 | Charles Frederick Crisp (D) | Died October 23, 1896 | Charles R. Crisp (D) | December 19, 1896 |
| 54th | NY 19 | Frank S. Black (R) | Resigned | Vacant | January 7, 1897 |
| 54th | KY 10 | Joseph M. Kendall (D) | Lost election contest | Nathan T. Hopkins (R) | February 18, 1897 |
| 55th | PA 25 | James J. Davidson (R) | Died January 2, 1897 | Joseph B. Showalter (R) | April 20, 1897 |
| 55th | ME 3 | Seth L. Milliken (R) | Died April 18, 1897 | Edwin C. Burleigh (R) | June 21, 1897 |
| 55th | IN 4 | William S. Holman (D) | Died April 22, 1896 | Francis M. Griffith (D) | December 6, 1897 |
| 55th | SC 6 | John L. McLaurin (D) | Resigned | James Norton (D) | December 6, 1897 |
| 55th | MO 1 | None | Representative-elect Richard P. Giles (D) died November 17, 1896 | James T. Lloyd (D) | June 1, 1897 |
| 55th | IL 6 | Edward D. Cooke (R) | Died June 24, 1897 | Henry S. Boutell (R) | November 23, 1897 |
| 55th | MA 1 | Ashley B. Wright (R) | Died August 14, 1897 | George P. Lawrence (R) | November 2, 1897 |
| 55th | NY 3 | Francis H. Wilson (R) | Resigned | Edmund H. Driggs (D) | December 5, 1897 |
| 55th | AL 4 | Thomas S. Plowman (D) | Lost election contest | William F. Aldrich (R) | February 9, 1898 |
| 55th | PA 23 | William A. Stone (R) | Resigned | William H. Graham (R) | November 29, 1898 |
| 55th | VA 4 | Sydney P. Epes (D) | Lost election contest | Robert T. Thorp (R) | March 23, 1898 |
| 55th | MA 13 | John Simpkins (R) | Died March 27, 1898 | William S. Greene (R) | May 31, 1898 |
| 55th | VA 2 | William A. Young (D) | Lost election contest | Richard A. Wise (R) | April 26, 1898 |
| 55th | MS 2 | William V. Sullivan (D) | Resigned | Thomas Spight (D) | July 5, 1898 |
| 55th | OH 19 | Stephen A. Northway (R) | Died September 8, 1898 | Charles W. F. Dick (R) | November 8, 1898 |
| 55th | MS 6 | William F. Love (D) | Died October 16, 1898 | Frank A. McLain (D) | December 12, 1898 |
| 55th | NY 34 | Warren B. Hooker (R) | Resigned | Vacant | November 10, 1898 |
| 55th | TN 4 | Benton McMillin (D) | Resigned | Vacant | January 6, 1899 |
| 55th | NY 2 | Denis M. Hurley (R) | Died | Redistricted to NY 7 | February 26, 1899 |
| 56th | ME 2 | Nelson Dingley Jr. (R) | Died | Charles E. Littlefield (R) | June 19, 1899 |
| 56th | ME 1 | Thomas Brackett Reed (R) | Resigned | Amos L. Allen (R) | November 6, 1899 |
| 56th | NE 6 | William Laury Greene (Pop) | Died | William Neville (Pop) | November 7, 1899 |
| 56th | OH 16 | Lorenzo Danford (R) | Died June 19, 1899 | Joseph J. Gill (R) | November 7, 1899 |
| 56th | PA 9 | Daniel Ermentrout (D) | Died September 7, 1899 | Henry D. Green (D) | November 7, 1899 |
| 56th | UT at-large | Brigham Henry Roberts (D) | Disqualified | William H. King (D) | April 25, 1900 |
| 56th | CA 2 | Marion De Vries (D) | Resigned | Samuel D. Woods (R) | November 6, 1900 |
| 56th | DE at-large | John H. Hoffecker (R) | Died June 16, 1900 | Walter O. Hoffecker (R) | November 6, 1900 |
| 56th | NJ 7 | William D. Daly (D) | Died July 31, 1900 | Allan L. McDermott (D) | November 6, 1900 |
| 56th | PA 5 | Alfred C. Harmer (R) | Died March 6, 1900 | Edward de Veaux Morrell (R) | November 6, 1900 |
| 57th | ME 4 | Charles A. Boutelle (R) | Died | Llewellyn Powers (R) | April 8, 1901 |
| 57th | PA 10 | Marriott Brosius (R) | Died March 16, 1901 | Henry B. Cassel (R) | November 5, 1901 |
| 57th | NJ 4 | Joshua S. Salmon (D) | Died May 6, 1902 | De Witt C. Flanagan (D) | June 18, 1902 |
| 57th | PA 17 | Rufus King Polk (D) | Died March 5, 1902 | Alexander Billmeyer (D) | November 4, 1902 |
| 58th | OR 1 | Thomas H. Tongue (R) | Died | Binger Hermann (R) | June 1, 1903 |
| 58th | OH 16 | Joseph J. Gill (R) | Resigned October 31, 1903 | Capell L. Weems (R) | November 3, 1903 |
| 58th | PA 4 | Robert H. Foerderer (R) | Died July 26, 1903 | Reuben Moon (R) | November 3, 1903 |
| 58th | PA 3 | Henry Burk (R) | Died December 5, 1903 | George A. Castor (R) | February 16, 1904 |
| 58th | OH 14 | William W. Skiles (R) | Died January 9, 1904 | Amos R. Webber (R) | May 19, 1904 |
| 58th | OH 19 | Charles W. F. Dick (R) | Resigned March 23, 1904 | W. Aubrey Thomas (R) | May 19, 1904 |
| 58th | CA 3 | Victor H. Metcalf (R) | Resigned | Joseph R. Knowland (R) | November 8, 1904 |
| 58th | NJ 4 | William M. Lanning (R) | Resigned June 6, 1904 | Ira W. Wood (R) | November 8, 1904 |
| 59th | WV 2 | Alston G. Dayton (R) | Resigned | Thomas Beall Davis (D) | June 6, 1905 |
| 59th | NE 1 | Elmer Burkett (R) | Resigned | Ernest M. Pollard (R) | July 18, 1905 |
| 59th | CA 1 | James Gillett (R) | Resigned | William F. Englebright (R) | November 6, 1906 |
| 59th | GA 1 | Rufus E. Lester (D) | Died | James W. Overstreet (D) | November 6, 1906 |
| 59th | PA 2 | Robert Adams Jr. (R) | Died June 1, 1906 | John E. Reyburn (R) | November 6, 1906 |
| 59th | PA 3 | George A. Castor (R) | Died February 19, 1906 | J. Hampton Moore (R) | November 6, 1906 |
| 59th | PA 12 | George R. Patterson (R) | Died March 21, 1906 | Charles N. Brumm (R) | November 6, 1906 |
| 60th | PA 2 | John E. Reyburn (R) | Resigned March 31, 1907 | Joel Cook (R) | November 5, 1907 |
| 60th | ME 2 | Charles E. Littlefield (R) | Resigned | John P. Swasey (R) | November 3, 1908 |
| 60th | ME 4 | Llewellyn Powers (R) | Died | Frank E. Guernsey (R) | November 3, 1908 |
| 60th | SD at-large | William H. Parker (R) | Died | Eben Martin (R) | November 3, 1908 |
| 61st | OH 21 | Theodore E. Burton (R) | Resigned March 3, 1909 | James H. Cassidy (R) | April 20, 1909 |
| 61st | GA 2 | James M. Griggs (D) | Died | Seaborn Roddenbery (D) | February 6, 1910 |
| 62nd | PA 2 | Joel Cook (R) | Died December 15, 1910 | William S. Reyburn (R) | May 23, 1911 |
| 62nd | IA 9 | Walter I. Smith (R) | Resigned March 15, 1911 | William R. Green (R) | June 5, 1911 |
| 62nd | KS 2 | Alexander C. Mitchell (R) | Died July 7, 1911 | Joseph Taggart (D) | November 7, 1911 |
| 62nd | NE 3 | James P. Latta (D) | Died September 11, 1911 | Dan V. Stephens (D) | November 7, 1911 |
| 62nd | NJ 1 | Henry C. Loudenslager (R) | Died August 12, 1911 | William J. Browning (R) | November 7, 1911 |
| 62nd | PA 14 | George W. Kipp (D) | Died July 24, 1911 | William D. B. Ainey (R) | November 7, 1911 |
| 62nd | TN 10 | George Gordon (D) | Died August 9, 1911 | Kenneth McKellar (D) | November 7, 1911 |
| 62nd | PA 1 | Henry H. Bingham (R) | Died March 22, 1912 | William Scott Vare (R) | July 30, 1912 |
| 62nd | VT 1 | David J. Foster (R) | Died | Frank L. Greene (R) | July 30, 1912 |
| 62nd | NJ 6 | William Hughes (D) | Resigned September 12, 1912 | Archibald C. Hart (D) | November 5, 1912 |
| 63rd | NJ 6 | Lewis J. Martin (D) | Died May 5, 1913 | Archibald C. Hart (D) | July 22, 1913 |
| 63rd | ME 3 | Forrest Goodwin (R) | Died | John A. Peters (R) | September 9, 1913 |
| 63rd | WV 1 | John W. Davis (D) | Resigned | Matthew M. Neely (D) | October 14, 1913 |
| 63rd | GA 2 | Seaborn Roddenbery (D) | Died | Frank Park (D) | November 4, 1913 |
| 63rd | NJ 7 | Robert G. Bremner (D) | Died February 5, 1914 | Dow H. Drukker (R) | April 7, 1914 |
| 63rd | GA 10 | Thomas W. Hardwick (D) | Resigned | Carl Vinson (D) | November 3, 1914 |
| 63rd | NJ 9 | Walter I. McCoy (R) | Resigned October 3, 1914 | Richard W. Parker (R) | December 1, 1914 |
| 64th | PA 24 | William M. Brown (R) | Died January 31, 1915 | Henry W. Temple (R) | November 2, 1915 |
| 64th | WV 2 | William Gay Brown Jr. (D) | Died | George Meade Bowers (R) | May 9, 1916 |
| 64th | CA 10 | William Stephens (R) | Resigned | Henry S. Benedict (R) | November 7, 1916 |
| 64th | WV 4 | Hunter Holmes Moss Jr. (R) | Died | Harry C. Woodyard (R) | November 7, 1916 |
| 64th | GA 8 | Samuel Joelah Tribble (D) | Died | Tinsley W. Rucker Jr. (D) | January 11, 1917 |
| 65th | Charles H. Brand (D) |
| 64th | SC 5 | David E. Finley (D) | Died | Paul G. McCorkle (D) | February 21, 1917 |
| 65th | William F. Stevenson (D) |
| 65th | NH 1 | Cyrus A. Sulloway (R) | Died | Sherman Everett Burroughs (R) | May 29, 1917 |
| 65th | ND 1 | Henry Thomas Helgesen (R) | Died | John Miller Baer (R) | July 10, 1917 |
| 65th | PA 28 | Orrin D. Bleakley (R) | Resigned April 3, 1917 | Earl H. Beshlin (D) | November 6, 1917 |
| 65th | GA 4 | William C. Adamson (D) | Resigned | William C. Wright (D) | January 16, 1918 |
| 65th | NJ 5 | John H. Capstick (R) | Died March 17, 1918 | William F. Birch (R) | November 5, 1918 |
| 65th | OH 14 | Ellsworth Raymond Bathrick (D) | Died December 23, 1917 | Martin L. Davey (D) | November 5, 1918 |
| 65th | PA 22 | Edward E. Robbins (R) | Died January 25, 1919 | John H. Wilson (D) | March 4, 1919 |
| 66th | AK at-large | Charles August Sulzer (D) | Died during electoral recount | George Barnes Grigsby (D) | June 5, 1919 |
| 66th | OK 5 | Joseph Bryan Thompson (D) | Died September 18, 1919 | John W. Harreld (R) | November 8, 1919 |
| 66th | WI 5 | Victor L. Berger (S) | Unseated after disqualification | Victor L. Berger (S)[u] | December 19, 1919 |
| 66th | NJ 1 | William J. Browning (R) | Died March 24, 1920 | Francis F. Patterson Jr. (R) | November 2, 1920 |
| 66th | OK 8 | Dick Thompson Morgan (R) | Died July 4, 1920 | Charles Swindall (R) | November 2, 1920 |
| 66th | PA 3 | J. Hampton Moore (R) | Resigned January 4, 1920 | Harry C. Ransley (R) | November 2, 1920 |
| 67th | CA 9 | Charles F. Van de Water (R) | Died | Walter F. Lineberger (R) | February 15, 1921 |
| 67th | PA at-large | Mahlon M. Garland (R) | Died November 19, 1920 | Thomas S. Crago (R) | September 20, 1921 |
| 67th | ME 3 | John A. Peters (R) | Resigned | John E. Nelson (R) | March 20, 1922 |
| 67th | HI at-large | Jonah Kūhiō Kalaniana'ole (R) | Died | Henry Alexander Baldwin (R) | March 25, 1922 |
| 67th | CA 6 | John A. Elston (R) | Died | James H. MacLafferty (R) | November 7, 1922 |
| 67th | IL at-large | William E. Mason (R) | Died June 16, 1921 | Winnifred Huck (R) | November 7, 1922 |
| 67th | NE 1 | C. Frank Reavis (R) | Resigned | Roy H. Thorpe (R) | November 7, 1922 |
| 67th | NE 6 | Moses Kinkaid (R) | Died | Augustin Reed Humphrey (R) | November 7, 1922 |
| 68th | CA 5 | John I. Nolan (R) | Died | Mae Nolan (R) | January 23, 1923 |
| 68th | NY 19 | None | Representative-elect Samuel Marx (D) died | Sol Bloom (D) | January 30, 1923 |
| 68th | CA 10 | Henry Z. Osborne (R) | Died | John D. Fredericks (R) | May 1, 1923 |
| 68th | VT 2 | Porter H. Dale (R) | Resigned | Ernest Willard Gibson (R) | November 6, 1923 |
| 68th | IL 2 | Vacant | Rep. James R. Mann died during previous congress | Morton D. Hull (R) | April 3, 1923 |
| 68th | CA 10 | Vacant | Rep. Henry Z. Osborne died during previous congress | John D. Fredericks (R) | May 1, 1923 |
| 68th | NY 16 | Vacant | Rep. Bourke Cockran died during previous congress | John J. O'Connor (D) | November 6, 1923 |
| 68th | AL 2 | John R. Tyson (D) | Died | J. Lister Hill (D) | August 14, 1923 |
| 68th | MI 3 | John M. C. Smith (R) | Died | Arthur B. Williams (R) | June 19, 1923 |
| 68th | IA 8 | Horace M. Towner (R) | Resigned April 1, 1923 | Hiram K. Evans (R) | June 4, 1923 |
| 68th | NY 11 | Daniel J. Riordan (D) | Died April 28, 1923 | Anning S. Prall (D) | November 6, 1923 |
| 68th | IL 4 | John W. Rainey (D) | Died May 4, 1923 | Thomas A. Doyle (D) | November 6, 1923 |
| 68th | AR 6 | Lewis E. Sawyer (D) | Died May 5, 1923 | James B. Reed (D) | October 6, 1923 |
| 68th | WA 5 | J. Stanley Webster (R) | Resigned May 8, 1923 | Samuel B. Hill (D) | September 25, 1923 |
| 68th | NC 2 | Claude Kitchin (D) | Died May 31, 1923 | John H. Kerr (D) | November 6, 1923 |
| 68th | NY 32 | Luther W. Mott (R) | Died July 10, 1923 | Thaddeus C. Sweet (R) | November 6, 1923 |
| 68th | VT 2 | Porter H. Dale (R) | Resigned August 11, 1923 | Ernest Willard Gibson (R) | November 6, 1923 |
| 68th | KY 7 | J. Campbell Cantrill (D) | Died September 2, 1923 | Joseph W. Morris (D) | November 30, 1923 |
| 68th | NY 24 | James V. Ganly (D) | Died September 7, 1923 | Benjamin L. Fairchild (R) | November 6, 1923 |
| 68th | MS 3 | Benjamin G. Humphreys II (D) | Died October 16, 1923 | William Y. Humphreys (D) | November 27, 1923 |
| 68th | ND 2 | George M. Young (R) | Resigned | Thomas Hall (R) | November 4, 1924 |
| 69th | MA 5 | John Jacob Rogers (R) | Died | Edith Nourse Rogers (R) | June 30, 1925 |
| 69th | NJ 3 | T. Frank Appleby (R) | Died December 15, 1924 | Stewart H. Appleby (R) | November 3, 1925 |
| 69th | KY 10 | John W. Langley (R) | Resigned | Andrew J. Kirk (R) | February 13, 1926 |
| 69th | CA 2 | John Raker (D) | Died | Harry Englebright (R) | August 31, 1926 |
| 69th | CA 5 | Lawrence Flaherty (R) | Died | Richard Welch (R) | August 31, 1926 |
| 70th | OR 3 | Maurice Crumpacker (R) | Died | Franklin Korell (R) | October 18, 1927 |
| 70th | OH 2 | Ambrose E. B. Stephens (R) | Died February 12, 1927 | Charles Tatgenhorst Jr. (R) | November 8, 1927 |
| 70th | PA 1 | James M. Hazlett (R) | Resigned October 20, 1927 | James M. Beck (R) | November 8, 1927 |
| 70th | OR 2 | Nicholas Sinnott (R) | Resigned | Robert Butler (R) | November 6, 1928 |
| 70th | PA 8 | Thomas S. Butler (R) | Died May 26, 1928 | James Wolfenden (R) | November 6, 1928 |
| 71st | AR 2 | William Allan Oldfield (D) | Died November 19, 1928 | Pearl Oldfield (D) | January 9, 1929 |
| 71st | PA 12 | John J. Casey (D) | Died May 5, 1929 | C. Murray Turpin (R) | June 4, 1929 |
| 71st | GA 5 | Leslie Steele (D) | Died | Robert Ramspeck (D) | October 2, 1929 |
| 71st | AR 4 | Otis Wingo (D) | Died | Effiegene Wingo (D) | November 4, 1930 |
| 71st | PA 32 | Stephen G. Porter (R) | Died June 27, 1930 | Edmund F. Erk (R) | November 4, 1930 |
| 71st | RI 3 | Jeremiah O'Connell (D) | Resigned | Francis Condon (D) | November 4, 1930 |
| 71st | UT 2 | Elmer O. Leatherwood (R) | Died | Frederick Loofbourow (R) | November 4, 1930 |
| 71st | WV 4 | James Hughes (R) | Died | Robert Hogg (R) | November 4, 1930 |
| 72nd | NY 7 | John Quayle (D) | Died November 27, 1930 | Matthew V. O'Malley[v] (D) | February 17, 1931 |
| 72nd | GA 1 | Charles Edwards (D) | Died | Homer Parker (D) | September 9, 1931 |
| 72nd | NY 7 | Matthew V. O'Malley (D) | Died May 26, 1931 | John J. Delaney (D) | November 3, 1931 |
| 72nd | OH 1 | Nicholas Longworth (R) | Died April 9, 1931 | John B. Hollister (R) | November 3, 1931 |
| 72nd | OH 20 | Charles A. Mooney (D) | Died May 29, 1931 | Martin L. Sweeney (D) | November 3, 1931 |
| 72nd | PA 2 | George Scott Graham (R) | Died July 4, 1931 | Edward L. Stokes (R) | November 3, 1931 |
| 72nd | NJ 5 | Ernest R. Ackerman (R) | Died October 18, 1931 | Percy Hamilton Stewart (D) | December 1, 1931 |
| 72nd | NH 1 | Fletcher Hale (R) | Died | William Rogers (D) | January 5, 1932 |
| 72nd | GA 6 | Samuel Rutherford (D) | Died | Carlton Mobley (D) | March 2, 1932 |
| 72nd | PA 20 | J. Russell Leech (R) | Resigned January 29, 1932 | Howard W. Stull (R) | April 26, 1932 |
| 72nd | TN 7 | Edward E. Eslick (D) | Died June 14, 1932 | Willa Eslick (D) | August 14, 1932 |
| 72nd | GA 3 | Charles Crisp (D) | Resigned | Bryant Castellow (D) | November 8, 1932 |
| 72nd | PA 6 | George A. Welsh (R) | Resigned May 31, 1932 | Robert L. Davis (R) | November 8, 1932 |
| 72nd | PA 18 | Edward M. Beers (R) | Died April 21, 1932 | Joseph F. Biddle (R) | November 8, 1932 |
| 73rd | GA 10 | Charles Brand (D) | Died | Paul Brown (D) | July 5, 1933 |
| 73rd | AZ at-large | Lewis Douglas (D) | Resigned |
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