From the record
“The Old Irion County Courthouse, on Public Square in Sherwood, Texas, was built in 1901. It was listed on the National Register of Historic Places in 1977 as Irion County Courthouse.”
Wikipedia article Old Irion County Courthouse, CC BY-SA 4.0.
One of 1 National Register listings published here for Irion County · listed in 1977 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service