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).
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