From the record
“The Moultrie County Courthouse is the only site in Moultrie County, Illinois that is listed on the National Register of Historic Places. Located in the county seat of Sullivan, the courthouse has been listed since 1995.”
Wikipedia article Moultrie County Courthouse, CC BY-SA 4.0.
One of 1 National Register listings published here for Moultrie County · listed in 1995 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service