61614 -- U.S. ZIP code Municipality (1990): PEORIA HEIGHTS, Illinois All ZIPs for this municipality (1990): 61603 61614 Population (2000): 34386 Housing Units (2000): 16542 Land area (2000): 16.686972 sq. miles (43.219056 sq. km) Water area (2000): 0.009702 sq. miles (0.025129 sq. km) Total area (2000): 16.696674 sq. miles (43.244185 sq. km) Located within: Illinois (IL) Location: 40.755343 N, 89.597999 W