61491 -- U.S. ZIP code Municipality (1990): WYOMING, Illinois All ZIPs for this municipality (1990): 61491 Population (2000): 2136 Housing Units (2000): 938 Land area (2000): 85.574446 sq. miles (221.636788 sq. km) Water area (2000): 0.223647 sq. miles (0.579242 sq. km) Total area (2000): 85.798093 sq. miles (222.216030 sq. km) Located within: Illinois (IL) Location: 41.068691 N, 89.760330 W