64491 -- U.S. ZIP code Municipality (1990): TARKIO, Missouri All ZIPs for this municipality (1990): 64491 Population (2000): 2350 Housing Units (2000): 1066 Land area (2000): 119.888147 sq. miles (310.508861 sq. km) Water area (2000): 0.042896 sq. miles (0.111099 sq. km) Total area (2000): 119.931043 sq. miles (310.619960 sq. km) Located within: Missouri (MO) Location: 40.452497 N, 95.366107 W