62801 -- U.S. ZIP code Municipality (1990): CENTRALIA, Illinois All ZIPs for this municipality (1990): 62801 Population (2000): 24141 Housing Units (2000): 9958 Land area (2000): 139.776510 sq. miles (362.019484 sq. km) Water area (2000): 0.249627 sq. miles (0.646532 sq. km) Total area (2000): 140.026137 sq. miles (362.666016 sq. km) Located within: Illinois (IL) Location: 38.523736 N, 89.125709 W