From the record
“The Oscoda County Courthouse was the county courthouse for Oscoda County, Michigan, located in Mio at 311 Morenci Ave (M-33). The courthouse was a Michigan State Historic Site and was listed on the National Register of Historic Places.”
Wikipedia article Oscoda County Courthouse, CC BY-SA 4.0.
One of 1 National Register listings published here for Oscoda County · listed in 1972 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service