Jennings, MO -- U.S. city in Missouri Population (2000): 15469 Housing Units (2000): 6798 Land area (2000): 3.688938 sq. miles (9.554305 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 3.688938 sq. miles (9.554305 sq. km) FIPS code: 37178 Located within: Missouri (MO), FIPS 29 Location: 38.721100 N, 90.261428 W ZIP Codes (1990): 63136 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Jennings, MO Jennings