Collinsville is a census-designated place (CDP) in Henry County, Virginia, United States. The population was 7,335 at the 2010 census, which was down from the 7,777 reported in 2000. 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 (36.721950, −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.
As of the census of 2000, there were 7,777 people, 3,466 households, and 2,197 families residing in the CDP. The population density was 988.1 people per square mile (381.5/km²). There were 3,758 housing units at an average density of 477.5/sq mi (184.4/km²). The racial makeup of the CDP was 84.84% White, 11.28% African American, 0.14% Native American, 0.63% Asian, 0.18% Pacific Islander, 1.98% from other races, and 0.95% from two or more races. Hispanic or Latino of any race were 3.77% of the population.
There were 3,466 households out of which 27.2% had children under the age of 18 living with them, 47.1% were married couples living together, 12.2% had a female householder with no husband present, and 36.6% were non-families.