61842 -- U.S. ZIP code Municipality (1990): FARMER CITY, Illinois All ZIPs for this municipality (1990): 61842 Population (2000): 2914 Housing Units (2000): 1236 Land area (2000): 81.111384 sq. miles (210.077510 sq. km) Water area (2000): 0.105538 sq. miles (0.273343 sq. km) Total area (2000): 81.216922 sq. miles (210.350853 sq. km) Located within: Illinois (IL) Location: 40.251945 N, 88.652791 W