Collinsville is a census-designated place (CDP) in Henry County, Virginia, United States. The population was 7,777 at the 2000 census. It is part of the Martinsville Micropolitan Statistical Area. Collinsville is also where the administration building and county courthouse of Henry County are located (though nearby Martinsville - an independent city which is not technically part of the county - is usually identified as the county seat).
Collinsville is located at 36°43′19″N 79°54′55″W / 36.72194°N 79.91528°W / 36.72194; -79.91528 (36.721950, -79.915253).
According to the United States Census Bureau, the CDP has a total area of 7.9 square miles (20.4 km²), of which, 7.9 square miles (20.4 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.25%) is water.