Gladstone, MO -- U.S. city in Missouri Population (2000): 26365 Housing Units (2000): 11919 Land area (2000): 7.996100 sq. miles (20.709802 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 7.996100 sq. miles (20.709802 sq. km) FIPS code: 27190 Located within: Missouri (MO), FIPS 29 Location: 39.211752 N, 94.561687 W ZIP Codes (1990): 64118 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Gladstone, MO Gladstone