Allen, OK -- U.S. town in Oklahoma Population (2000): 951 Housing Units (2000): 445 Land area (2000): 0.912569 sq. miles (2.363542 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.912569 sq. miles (2.363542 sq. km) FIPS code: 01400 Located within: Oklahoma (OK), FIPS 40 Location: 34.878022 N, 96.411895 W ZIP Codes (1990): 74825 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Allen, OK Allen