From the record
“The Carroll County Courthouse, located in Courthouse Square in Mount Carroll, is the county courthouse of Carroll County, Illinois. The courthouse, which was designed by Chicago architects Olmstead and Nicholson, was built in 1858 and has been used continuously since.”
Wikipedia article Carroll County Courthouse (Illinois), CC BY-SA 4.0.
One of 6 National Register listings published here for Carroll County · listed in 1973 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service


