Blackwell, OK -- U.S. city in Oklahoma Population (2000): 7668 Housing Units (2000): 3527 Land area (2000): 5.448597 sq. miles (14.111801 sq. km) Water area (2000): 0.007822 sq. miles (0.020260 sq. km) Total area (2000): 5.456419 sq. miles (14.132061 sq. km) FIPS code: 06600 Located within: Oklahoma (OK), FIPS 40 Location: 36.801764 N, 97.289856 W ZIP Codes (1990): 74631 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Blackwell, OK Blackwell