U.S. 431 is paired with unsigned State Route1 throughout almost all of Alabama, with the exception of Dothan, where it is paired with signed State Route 210 around the eastern portion of the bypass named Ross Clark Circle. There is also a business route through downtown Dothan signed as Business US 431 and locally known as Reeves Street which runs into Business US 231. The two routes are signed concurrently through downtown and known locally as N. Oates Street north of Main Street (Business US 84) and S. Oates Street south of Main Street. The southern terminus of US 431 is at the intersection of US 231 and the business spurs on the south side of Ross Clark Circle.