Grant -- U.S. County in Oklahoma Population (2000): 5144 Housing Units (2000): 2622 Land area (2000): 1000.561020 sq. miles (2591.441035 sq. km) Water area (2000): 3.046558 sq. miles (7.890549 sq. km) Total area (2000): 1003.607578 sq. miles (2599.331584 sq. km) Located within: Oklahoma (OK), FIPS 40 Location: 36.790006 N, 97.788044 W Headwords: Grant Grant, OK Grant County Grant County, OK