Hillsboro is a city in and the county seat of Montgomery County, Illinois, United States. Landmarks include Air Illinois Flight 710, Montgomery County Courthouse and Freeman-Brewer-Sawyer House. Hillsboro is the birthplace of Matt Hughes, mixed martial arts fighter.
- CountyMontgomery County
- Population5,902 (2020 U.S. Census)
- Historic places4 on the National Register































