East Peoria is a city in Tazewell County, Illinois, United States. The population was 22,484 at the 2020 census. East Peoria is a suburb of Peoria and is part of the Peoria, Illinois Metropolitan Statistical Area, located across the Illinois River from downtown Peoria. It is home to many Caterpillar Inc. facilities.

Tazewell County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 131,343. Its county seat and largest city is Pekin. It is pronounced with a short "a", to rhyme with "razz" rather than "raze."