Clayton has been the county seat since 1834, two years after the creation of Barbour County. Clayton is located geographically in the center of the county. The town was located at the headwaters of the Pea and Choctawhatchee rivers on the historic road from Hobdy's Bridge over the Pea River to Eufaula on the Chattahoochee River. By 1818, there were a few settlers in the area around Clayton, but settlement began in earnest around 1823. The town was named for Augustine S. Clayton, a Georgia jurist and congressman. Clayton became the county seat of Barbour County in 1833 and was laid out on a central courthouse square plan. The first Circuit Court was held in Clayton on September 23, 1833. The Clayton post office was established in September 1835 with John F. Keener as postmaster. Clayton, with a population of 200, was incorporated on December 21, 1841, by the Alabama Legislature. Its first mayor, after incorporation, was John Jackson.