Champaign is a city located in Champaign County, Illinois, in the United States. As of the 2020 census, the city had a population of 88,302, making it the tenth-most populous municipality in the state of Illinois.
The city serves as a principal city of the Champaign–Urbana metropolitan area, which recorded a population of 236,000 residents in 2020. Outside of the Chicago metropolitan area, Champaign ranks as the fourth most populous city in Illinois.