Online Highways Home > DC > Washington City Map with Features National Postal Museum Part of the Smithsonian Institution The National Postal Museum, a Smithsonian Institution museum, is located in the old Post Office building next to Union Station. The Museum was created by an agreement between the Smithsonian Institution and the United States Postal Service in 1990 and opened to the public in 1993. It is open 7 days a week, except Christmas. Admission is free. Read reviews and find hotels in Washington. Location: 2 Massachusetts Ave, N.E., Washington DC 20002 Telephone 202 633-9360 Fax 202 633-9393 See more History. Other upcoming events include:

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