Peoria is a city in Peoria County, Illinois, United States, and its county seat. Located on the Illinois River, the city had a population of 113,15…Peoria is a city in Peoria County, Illinois, United States, and its county seat. Located on the Illinois River, the city had a population of 113,150 as of the 2020 census, making it the eighth-most populous city in Illinois. It is the principal city of the Peoria metropolitan area in Central Illinois, consisting of Fulton, Marshall, Peoria, Stark, Tazewell, and Woodford counties and home to 402,391 people in 2020.
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