Martin -- U.S. County in Indiana Population (2000): 10369 Housing Units (2000): 4729 Land area (2000): 336.136235 sq. miles (870.588814 sq. km) Water area (2000): 4.391523 sq. miles (11.373992 sq. km) Total area (2000): 340.527758 sq. miles (881.962806 sq. km) Located within: Indiana (IN), FIPS 18 Location: 38.724504 N, 86.833305 W Headwords: Martin Martin, IN Martin County Martin County, IN