Greenfield, OK -- U.S. town in Oklahoma Population (2000): 123 Housing Units (2000): 62 Land area (2000): 0.133743 sq. miles (0.346393 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.133743 sq. miles (0.346393 sq. km) FIPS code: 31250 Located within: Oklahoma (OK), FIPS 40 Location: 35.728746 N, 98.377448 W ZIP Codes (1990): 73043 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Greenfield, OK Greenfield