Troy, MO -- U.S. city in Missouri Population (2000): 6737 Housing Units (2000): 2661 Land area (2000): 5.938319 sq. miles (15.380174 sq. km) Water area (2000): 0.009803 sq. miles (0.025389 sq. km) Total area (2000): 5.948122 sq. miles (15.405563 sq. km) FIPS code: 73942 Located within: Missouri (MO), FIPS 29 Location: 38.974922 N, 90.977132 W ZIP Codes (1990): 63379 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Troy, MO Troy