Warrenton is an unincorporated community in Warren County, Mississippi. It is located approximately 5 miles south of Vicksburg on U.S. Route 61. Warrenton is part of the Vicksburg Micropolitan Statistical Area. The county seat of Warren County from 1809 to 1836 and an important shipping point along the Mississippi River in the 19th century, when t…Warrenton is an unincorporated community in Warren County, Mississippi. It is located approximately 5 miles south of Vicksburg on U.S. Route 61. Warrenton is part of the Vicksburg Micropolitan Statistical Area. The county seat of Warren County from 1809 to 1836 and an important shipping point along the Mississippi River in the 19th century, when the course of the river moved away from the town in declined. Little trace remains of the settlement today.