U.S. Route 31A exists between Nashville and Pulaski, Tennessee. From Nashville, the road begins at Union St. in downtown Nashville and runs as 4th & 2nd Avenue South and South Nashville as Nolensville Pike. After passing through Davidson County, it goes through Williamson County as Nolensville Road. It then goes to a small town named Nolensville. It goes through Murfreesboro Road, and goes through as Horton Highway. it then goes as N Horton Pkwy. It heads into Marshall County and reaches the Fayetteville Hwy. before turning southwest to continue to Pulaski.