Watonga, OK -- U.S. city in Oklahoma Population (2000): 4658 Housing Units (2000): 1507 Land area (2000): 2.735073 sq. miles (7.083806 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 2.735073 sq. miles (7.083806 sq. km) FIPS code: 78950 Located within: Oklahoma (OK), FIPS 40 Location: 35.849249 N, 98.411591 W ZIP Codes (1990): 73772 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Watonga, OK Watonga