Heathsville is a census-designated place in and the county seat of Northumberland County, Virginia, United States. The population as of the 2010 Census was 142. It is located on U.S. Route 360 west of Reedville and east of Warsaw.The Heathsville Historic District, Coan Baptist Church, Howland Chapel School, Kirkland Grove Campground, Rice's Hotel, Oakley, St. Stephen's Church, Sunnyside, and The Academy are listed on the National Register of Historic Places. "Heathsville" is named after lawyer and politician John Heath.