Harrison -- U.S. County in Missouri Population (2000): 8850 Housing Units (2000): 4316 Land area (2000): 725.129200 sq. miles (1878.075926 sq. km) Water area (2000): 1.324003 sq. miles (3.429152 sq. km) Total area (2000): 726.453203 sq. miles (1881.505078 sq. km) Located within: Missouri (MO), FIPS 29 Location: 40.333346 N, 93.973775 W Headwords: Harrison Harrison, MO Harrison County Harrison County, MO