Oak Grove, KY -- U.S. city in Kentucky Population (2000): 7064 Housing Units (2000): 2912 Land area (2000): 10.306566 sq. miles (26.693883 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 10.306566 sq. miles (26.693883 sq. km) FIPS code: 57090 Located within: Kentucky (KY), FIPS 21 Location: 36.658374 N, 87.419565 W ZIP Codes (1990): 42262 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Oak Grove, KY Oak Grove