Peoria Heights is a village lying almost entirely in Peoria County in the U.S. state of Illinois. The population was 6,156 at the 2010 census, down from 6,635 in 2000. Peoria Heights is a suburb of Peoria and is surrounded by the city except for its eastern boundary on Peoria Lake, a relatively wider section of the Illinois River. It is part of the Peoria, Illinois Metropolitan Statistical Area.