- Source: United States Post Office (St. Johnsville, New York)
- United States Post Office (St. Johnsville, New York)
- St. Johnsville (village), New York
- List of United States post offices
- List of municipalities in New York
- List of United States post office murals
- Wappingers Falls, New York
- Johnstown, New York
- List of law enforcement agencies in New York (state)
- Bucks County, Pennsylvania
- List of National Historic Landmarks in New York
US Post Office-St. Johnsville is a historic post office building located at St. Johnsville in Montgomery County, New York, United States. It was built in 1936, and is one of a number of post offices in New York State designed by the Office of the Supervising Architect of the Treasury Department under Louis A. Simon. It is a one-story, symmetrical brick building on a stone watertable in the Colonial Revival style. It features a copper clad gable roof with a square, flat topped cupola with a weathervane. The interior features a 1940 mural by Jirayr H. Zorthian (1911-2004) titled "Early St. Johnsville Pioneers."
It was listed on the National Register of Historic Places in 1989.