Audrain -- U.S. County in Missouri Population (2000): 25853 Housing Units (2000): 10881 Land area (2000): 693.095856 sq. miles (1795.109951 sq. km) Water area (2000): 3.692145 sq. miles (9.562612 sq. km) Total area (2000): 696.788001 sq. miles (1804.672563 sq. km) Located within: Missouri (MO), FIPS 29 Location: 39.206389 N, 91.796348 W Headwords: Audrain Audrain, MO Audrain County Audrain County, MO