Martin County is a county located in the U.S. state of North Carolina. As of the 2020 census, the population was 22,031. Its county seat is Williamston.

Williamston is a town and the county seat of Martin County, North Carolina, United States. The population was 5,248 at the 2020 census. It is located in North Carolina's Inner Banks region. The closest major city is Greenville, approximately 28 miles (45 km) to the southwest.