U.S. Route 231 (US 231) is a north–south U.S highway that is a parallel route of US 31. It runs for 912 miles (1,468 km) from St. John, Indiana, at US 41...

U.S. Route 231 (US 231) is the longest numbered highway in Indiana, covering over 284 miles (457 km). It is a main north–south highway in the western part...

U.S. Route 231 (US 231) in Alabama runs north–south up through the eastern half of Alabama for 306.273 miles (492.899 km). US 231 enters the state from...

U.S. Route 231 (US 231) in Florida is a north–south United States Highway. It runs 52 miles (84 km) from Panama City north to the Alabama State Line in...

U.S. Route 231 (US 231) in Kentucky runs 114 miles (183 km) from the Tennessee state line near Adolphus to the William H. Natcher Bridge on the Ohio River...

special routes of U.S. Route 231 exist and have existed in the past. In order from south to north, these special routes of U.S. Route 231 (US 231) are as...

U.S. Route 231 (US 231) in Tennessee runs north–south for 121.15 miles (194.97 km), entirely in Middle Tennessee, that starts south of Fayetteville at...

U.S. Route 431 (US 431) is a spur of U.S. Route 31. It currently travels for approximately 556 miles (895 km) from US 231/Alabama State Route 210 and...

U.S. Route 99 (US 99) was a main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico,...

State Route 231. It became State Route 216 in the 1928 renumbering and State Route 124 in the 1933 renumbering, finally becoming part of the extended US 219...