Mahaska -- U.S. County in Iowa Population (2000): 22335 Housing Units (2000): 9551 Land area (2000): 570.870496 sq. miles (1478.547734 sq. km) Water area (2000): 2.529753 sq. miles (6.552029 sq. km) Total area (2000): 573.400249 sq. miles (1485.099763 sq. km) Located within: Iowa (IA), FIPS 19 Location: 41.320852 N, 92.643490 W Headwords: Mahaska Mahaska, IA Mahaska County Mahaska County, IA