Peoria County is located in the U.S. state of Illinois. The 2020 United States census listed its population at 181,830. Its county seat is Peoria. Peoria County is part of the Peoria metropolitan area

Princeville is a village in Peoria County, Illinois, United States. The population was 1,728 at the 2020 census, down from 1,738 in 2010. It is part of the Peoria, Illinois Metropolitan Statistical Ar