Montgomery County, Illinois

county in Illinois, United States

Montgomery County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 28,288.[1] The county seat is Hillsboro.[2][3] and largest city is Litchfield.

Montgomery County was founded in 1821.


  1. "QuickFacts: Montgomery County, Illinois". United States Census Bureau. Retrieved August 11, 2023.
  2. "Hillsboro Illinois". City of Hillsboro. Retrieved 15 February 2012.
  3. "Find a County". National Association of Counties. Retrieved 2011-06-07.