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There are 100 United States Postal Service collection boxes and post offices available to the public in Washington, DC. You can use any one of these locations to mail your letter or small package via USPS.
Post Offices and Mailboxes in District of Columbia
Where to buy postage stamps in Washington, DC
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Mount Rainier, MD
Baileys Xrds, VA
Chevy Chase, MD
Takoma Park, MD
Fort Myer, VA
Bolling Afb, DC