From the record
“The Pioneer School stands in an isolated location in Park County, Wyoming, about 8 miles (13 km) north of Clark, in the Clark Fork Valley near the Montana border. The frame structure is an example of a country school built to serve students in rural areas prior to the introduction of school bus routes to more centrally located facilities.”
Wikipedia article Pioneer School, CC BY-SA 4.0.
One of 38 National Register listings published here for Park County · listed in 1993 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service