64642 -- U.S. ZIP code Municipality (1990): GILMAN CITY, Missouri All ZIPs for this municipality (1990): 64642 Population (2000): 845 Housing Units (2000): 486 Land area (2000): 110.056403 sq. miles (285.044762 sq. km) Water area (2000): 0.099266 sq. miles (0.257098 sq. km) Total area (2000): 110.155669 sq. miles (285.301860 sq. km) Located within: Missouri (MO) Location: 40.154895 N, 93.839502 W