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Northampton County is a county located in the Commonwealth of Virginia. As of the 2020 census, the population was 12,282. Its county seat is Eastville. Northampton and Accomack Counties are a part of the larger Eastern Shore of Virginia. The county is the center of the late Eocene meteor strike that resulted in the Chesapeake Bay impact crater. The Northampton County Courthouse Historic District is part of the Eastville Historic District at the county seat.