U.S. Route 31 in Alabama

U.S. Route 31
US 31 highlighted in red
Route information
Maintained by ALDOT
Length	386.449 mi[1] (621.929 km)
Existed	1926 (1926)–present
Major junctions
South end	US 90 / US 98 in Spanish Fort
Major intersections	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
← SR 30 → SR 32
← SR 2 SR 3 → SR 4

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.