U.S. Route 31 in Alabama

U.S. Route 31
U.S. Route 31
	US 31 highlighted in red
Route information
	Maintained by ALDOT
Length	386.449 mi (621.929 km)
Existed	1926–present
Major junctions
South end	US 90 / US 98 in Spanish Fort
	US 29 / SR 113 in Flomaton; US 84 near Evergreen; I-65 at Hope Hull; US 80 / SR 21 in Montgomery; US 82 / SR 14 in Prattville; I-459 near Hoover; US 280 in Homewood; I-20 / I-59 in Birmingham; US 278 in Cullman; US 72 in Athens;
North end	I-65 / US 31 at Tennessee state line near Ardmore
Location
Country	United States
State	Alabama
Counties	Baldwin, Escambia, Conecuh, Butler, Lowndes, Montgomery, Elmore, Autauga, Chilton, Shelby, Jefferson, Blount, Cullman, Morgan, Limestone
Highway system
	United States Numbered Highway System; List; Special; Divided; Alabama State Highway System; Interstate; US; State;

U.S. Route 31 (US 31) in Alabama runs north–south up through the heart of Alabama for 386.449 miles (621.929 km). US 31 proper begins at a junction with US 90 and US 98 in Spanish Fort and exits the state into Tennessee running concurrently with Interstate 65 (I-65) near Ardmore. US 31 enters the limits of major cities Montgomery, Birmingham, and Decatur. Throughout the state, with the exception of its concurrency with I-65 north of Athens, US 31 runs concurrently with the unsigned State Route 3 (SR 3). Today, aside from portions through major towns and cities, US 31 is largely a rural two-lane highway. The route has largely been supplanted by I-65, with which it has eight junctions and two concurrencies.