Mount Carroll is a city in Carroll County, Illinois, United States Shimer College was established in Mt. Carroll in 1853, but mounting debts forced a move to Waukegan, Illinois in 1979. The campus now is home to several organizations, most notably the Campbell Center for Historic Preservation Studies. Political scientist Robert Keohane grew up in Mt. Carroll before attending Shimer. A Blackwater USA training facility opened near the town in 2006.