From the record
“The Old Harrison County Courthouse, located in Magnolia, Iowa, United States, was built in 1873. It was listed on the National Register of Historic Places in 1983 as a part of the County Courthouses in Iowa Thematic Resource.”
Wikipedia article Old Harrison County Courthouse (Iowa), CC BY-SA 4.0.
One of 13 National Register listings published here for Harrison County · listed in 1983 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

