Smith -- U.S. County in Mississippi Population (2000): 16182 Housing Units (2000): 7005 Land area (2000): 635.887128 sq. miles (1646.940031 sq. km) Water area (2000): 1.379128 sq. miles (3.571926 sq. km) Total area (2000): 637.266256 sq. miles (1650.511957 sq. km) Located within: Mississippi (MS), FIPS 28 Location: 31.985054 N, 89.518021 W Headwords: Smith Smith, MS Smith County Smith County, MS