Martin -- U.S. County in Minnesota Population (2000): 21802 Housing Units (2000): 9800 Land area (2000): 709.344871 sq. miles (1837.194705 sq. km) Water area (2000): 20.210480 sq. miles (52.344900 sq. km) Total area (2000): 729.555351 sq. miles (1889.539605 sq. km) Located within: Minnesota (MN), FIPS 27 Location: 43.676952 N, 94.537076 W Headwords: Martin Martin, MN Martin County Martin County, MN