Park Falls Post Office is located at 109 1st Street N in downtown Park Falls. It is on the National Register of Historic Places.
The Park Falls Federal Building was constructed in 1936, and housed the post office in addition to offices for the newly-designated Chequamegon-Nicolet National Forest, the Civilian Conservation Corps, and other smaller federal agencies. A 1930’s Works Projects Administration (WPA) mural for the lobby of the post office was painted by Madison artist John Watrous. Visitors can still enjoy the unusual mural depicting a river fight among river drivers on the Flambeau River.