61435 -- U.S. ZIP code Municipality (1990): GERLAW, Illinois All ZIPs for this municipality (1990): 61435 Population (2000): 85 Housing Units (2000): 35 Land area (2000): 9.519893 sq. miles (24.656409 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 9.519893 sq. miles (24.656409 sq. km) Located within: Illinois (IL) Location: 40.972589 N, 90.548354 W