Rock Island, OK -- U.S. town in Oklahoma Population (2000): 709 Housing Units (2000): 279 Land area (2000): 12.098463 sq. miles (31.334873 sq. km) Water area (2000): 0.076915 sq. miles (0.199209 sq. km) Total area (2000): 12.175378 sq. miles (31.534082 sq. km) FIPS code: 63600 Located within: Oklahoma (OK), FIPS 40 Location: 35.182759 N, 94.477029 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Rock Island, OK Rock Island