From the record
“The Oswego United States Post Office in Oswego, Kansas is listed on the National Register of Historic Places as US Post Office - Oswego, located at 819 4th Street. Built in 1940, it was listed on the National Register of Historic Places in 1989.”
Wikipedia article Oswego United States Post Office, CC BY-SA 4.0.
One of 11 National Register listings published here for Labette County · listed in 1989 · category: Building.
Sources: the Wikipedia article · the National Register database, National Park Service
