61078 -- U.S. ZIP code Municipality (1990): SHANNON, Illinois All ZIPs for this municipality (1990): 61078 Population (2000): 1430 Housing Units (2000): 567 Land area (2000): 51.008553 sq. miles (132.111540 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 51.008553 sq. miles (132.111540 sq. km) Located within: Illinois (IL) Location: 42.158340 N, 89.735550 W