61611 -- U.S. ZIP code Municipality (1990): EAST PEORIA, Illinois All ZIPs for this municipality (1990): 61611 Population (2000): 23663 Housing Units (2000): 10354 Land area (2000): 36.657328 sq. miles (94.942040 sq. km) Water area (2000): 0.011531 sq. miles (0.029866 sq. km) Total area (2000): 36.668859 sq. miles (94.971906 sq. km) Located within: Illinois (IL) Location: 40.683387 N, 89.544932 W