The U.S. Post Office in Beacon, New York, is located on Main Street (New York State Route 52 Business). It serves the ZIP Code 12508, covering the entire city of Beacon and some of the neighboring areas of the Town of Fishkill. It is a stone structure in the Dutch Colonial Revival architectural style built in the mid-1930s. In 1988 it was listed on the National Register of Historic Places along with many other older post offices in the state.