State Route 13 (SR-13) is a 336-mile-long (541 km) state highway in the western part of the U.S. state of Alabama. Except for a portion roughly between Berry and Russellville, SR-13 is the unsigned designation for U.S. Highway 43. Thus, while the total distance of the route is over 330 miles (530 km), as an independently signed route, SR-13 is only 60 miles (97 km) long.The southern terminus of SR-13 and US-43 is at their junction with U.S. Highway 90 and unsigned State Route 16 in Mobile.