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is a city in Belmont County, Ohio in the United States. It is part of the Wheeling, West Virginia Metropolitan Statistical Area. The population was 5,057 at the 2000 census. This county seat of Belmont County has been nicknamed "Paradise on the Hill." St. Clairsville was named after Northwest Territory Governor and Revolutionary War Major-General Arthur St. Clair.
St.Clairsville is located at (40.079379, -80.901274).
According to the United States Census Bureau, the city has a total area of 2.2 square miles (5.6 km²), all of it land.