Bloomington is a city in Monroe County, Indiana, United States, and its county seat. The population was 79,168 at the 2020 census. It is the seventh-most populous city in Indiana and the fourth-most populous outside the Indianapolis metropolitan area. It is the home of Indiana University Bloomington, the flagship campus of the Indiana University system. Established in 1820, IU Bloomington enrolls over 45,000 students.