Lumberton is a city in Robeson County, North Carolina, United States. The population has grown to 21,542 in the 2010 census from 20,795 in the 2000 census. It is the county seat of Robeson County. Lumberton, located in southern North Carolina's Inner Banks region, is located on the Lumber River. Founded in 1787 by John Willis, an officer in the American Revolution, Lumberton was originally a shipping point for lumber used by the Navy, which was sent downriver to Georgetown, South Carolina.