Champaign ( sham-PAYN) is a city in Champaign County, Illinois, United States. The population was 88,302 at the 2020 census. It is the tenth-most populous municipality in Illinois and the fourth most populous city in the state outside the Chicago metropolitan area. It is a principal city of the Champaign–Urbana metropolitan area, which had 236,000 residents in 2020. Champaign shares the main campus of the University of Illinois with its twin city of Urbana, and is also home to Parkland College, which gives the city a large student population during the academic year. Due to the university and a number of technology startup companies, it is often referred to as a hub of the Illinois Silicon Prairie. Champaign houses offices for the Fortune 500 companies Abbott, Archer Daniels Midland (ADM), Caterpillar, John Deere, Dow Chemical Company, IBM, and State Farm. Champaign also serves as the headquarters for several companies, including Jimmy John's.