Harrison -- U.S. County in Indiana Population (2000): 34325 Housing Units (2000): 13699 Land area (2000): 485.217325 sq. miles (1256.707048 sq. km) Water area (2000): 1.659603 sq. miles (4.298352 sq. km) Total area (2000): 486.876928 sq. miles (1261.005400 sq. km) Located within: Indiana (IN), FIPS 18 Location: 38.213797 N, 86.107584 W Headwords: Harrison Harrison, IN Harrison County Harrison County, IN