Harwinton is a town in Litchfield County, Connecticut, United States. The population was 5,283 at the 2000 census. The name of the town is a blend of Hartford and Windsor. According to the United States Census Bureau, the town has a total area of 31.1 square miles (81km2), of which, 30.8 square miles (80km2) of it is land and 0.3 square miles (0.78km2) of it (1.13%) is water. The southeastern portion of the town contains the Roraback Wildlife Area and several reservoirs.