Harrison -- U.S. County in Ohio Population (2000): 15856 Housing Units (2000): 7680 Land area (2000): 403.526409 sq. miles (1045.128556 sq. km) Water area (2000): 7.264180 sq. miles (18.814140 sq. km) Total area (2000): 410.790589 sq. miles (1063.942696 sq. km) Located within: Ohio (OH), FIPS 39 Location: 40.300540 N, 81.077776 W Headwords: Harrison Harrison, OH Harrison County Harrison County, OH