Peoria, Illinois is the largest city on the Illinois River and the county seat of Peoria County, Illinois, in the United States. As of the 2000 census, the city had a total population of 112,936. The Peoria Metropolitan Statistical Area had a population of 369,161 in 2005. Peoria apartments for rent comparison page shows most up to date rent information on Peoria apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.