Champaign is a city in Champaign County, Illinois, United States. The city is 135 mi south of Chicago, 124 mi west of Indianapolis, Indiana, and 178 mi northeast of St. Louis, Missouri. The United States Census Bureau estimates the city was home to 88,029 people as of July 1, 2018. Champaign is the tenth-most populous city in Illinois, and the state's fourth-most populous city outside the Chicago metropolitan area. It is included in the Champaign–Urbana metropolitan area.