Irmo, SC -- U.S. town in South Carolina Population (2000): 11039 Housing Units (2000): 4066 Land area (2000): 4.134070 sq. miles (10.707192 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 4.134070 sq. miles (10.707192 sq. km) FIPS code: 35890 Located within: South Carolina (SC), FIPS 45 Location: 34.092629 N, 81.186073 W ZIP Codes (1990): 29063 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Irmo, SC Irmo