Collinsville is a town in Grayson County, Texas, in the United States. As of the 2000 census, the town population was 1,235. It is part of the Sherman–Denison Metropolitan Statistical Area.
Collinsville is located at 33°33′39″N 96°54′40″W / 33.56083°N 96.91111°W / 33.56083; -96.91111 (33.560731, -96.911027).
According to the United States Census Bureau, the town has a total area of 0.7 square miles (1.9 km²), all of it land.