Pekin is a the county seat of Tazewell County in the U.S. state of Illinois. Located on the Illinois River, Pekin is also the largest city of Tazewell County, and a key part of the Peoria metropolitan area. As of the 2010 census, its population is 34,094. A small portion of the city limits extends into Peoria County. Pekin is the 13th-most populous city in Illinois, outside of the Chicago Metropolitan Area.
Pekin has a large park with a lagoon, Mineral Springs Park, located near Pekin Hospital and a senior center. Pekin is home to a high-rise residential facility of the United Auto Workers. It is the home of the Pekin Federal Correctional Institution. A regional insurance company, Pekin Insurance, has its home office in Pekin.
In Illinois as other areas, various cultures of indigenous peoples lived along the rivers, for transportation, water and fishing. At the time of European contact, the several historical tribes in the area were of the Anishinaabe-language family, within the larger Algonquian-speaking tribes.