Alabama State Route

State Route System
Highway markers for SR 3, SR 17, and SR 153
Map of Alabama State Route System
Highway names
Interstates:	Interstate nn (I-nn)
US Highways:	U.S. Route nn (US-nn)
State:	State Route nn (SR-nn)
System links
Alabama Highways Interstate US State

The State Route System in Alabama uses the standard numbering convention: odd numbers signify a north-south state route, and even numbers signify an east-west route. Often more than one route number shares the same roadway, so identifying which route the mile markers are for is often difficult.

In no case does a state route number mirror a U.S. Highway number. As such, the following state routes do not exist: 11, 29, 31, 43, 45, 72, 78, 80, 82, 84, 90, 98, 231, 278, 280, 331, 411, or 431.

Lengths are from ADOT Milepost Maps unless otherwise noted