Bloomington is a city in and the county seat of McLean County, Illinois, United States. It is adjacent to the town of Normal, and is the more populous of the two principal municipalities of the Bloomington–Normal metropolitan area. Bloomington is 135 miles southwest of Chicago and 162 miles northeast of St. Louis. The 2020 census showed the city had a population of 78,680, making it the 13th-most populated city in Illinois and the fifth-most populous outside the Chicago Metropolitan Area.