Washington County is a county located in the U.S. state of North Carolina. As of the 2020 census, the population was 11,003. Its county seat is Plymouth. The county was formed in 1799 from the western third of Tyrrell County. It was named for George Washington.

Plymouth is the most populous town in Washington County, North Carolina, United States. The population was 3,320 at the 2020 census. It is the county seat of Washington County. Plymouth is located on the Roanoke River about seven miles (11 km) upriver from its mouth into the Albemarle Sound in North Carolina's Inner Banks region.