Mount Airy Post Office

505 Windy Knoll Dr, Mount Airy, MD 21771

Contact Numbers:

Phone: 301-829-1199
Fax: 301-829-3627
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Bulk Mail Acceptance Hours

Monday-Friday 10:00am - 11:00am, 12:00pm - 2:00pm
Saturday-Sunday Closed

Pickup Services Hours

Monday-Friday 8:00am - 5:00pm
Saturday 8:00am - 1:00pm
Sunday Closed

Lobby Hours

Monday-Sunday 12:01am - 11:59pm

PO Box Access Hours

Monday-Sunday 12:01am - 11:59pm

Last Collection Times

Monday-Friday 5:00pm
Saturday 2:00pm
Sunday Closed

Carrier Facility Hours

Monday-Friday 7:00am - 5:00pm
Saturday 7:00am - 4:00pm
Sunday Closed

Passport Acceptance Hours

Monday-Friday 10:00am - 3:00pm
Saturday 10:00am - 12:00pm
Sunday Closed

  • Visit our Passport FAQ page for a complete overview of what to bring, what you need to know, and how long it will take.
  • You will need two forms of Identification with copies.
  • A passport quality photo if no available photo hours listed.
  • The appropriate application form printed and filled out, and the required fee for applying or renewing.
  • You can find up to date costs, information, and forms at the State Departments Travel Site

*An appointment is required to apply for or renew US Passports. Please Call.

Passport Photo Hours

Monday-Friday 10:00am - 3:00pm
Saturday 10:00am - 12:00pm
Sunday Closed

Global Express Guaranteed® Hours

Monday-Friday 9:00am - 5:00pm
Saturday 9:00am - 1:00pm
Sunday Closed

  • Bulk Mail Acceptance
  • Burial Flags
  • Business Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • General Delivery
  • Global Express Guaranteed®
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Packaged Stamps
  • Passport Acceptance
  • Passport Photo
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Priority Mail International®
  • Lobby has Copier
  • Lot Parking

Visit our Links Page for Change of Address, Hold Mail/Stop Delivery, PO Boxes™ rentals and fees, Rates on Postage Stamps and Freight/Shipping, Holidays, Bulk Mail, Money Orders, and Available Jobs.

*Please call to verify information. Is anything incorrect? Let us know here

Nearby Post Offices:

1280 Hopkins Aly
3.5 miles away

7623 Woodbine Rd
3.6 miles away

26400 Woodfield Rd
3.9 miles away

4411 Green Valley Rd
4.9 miles away


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DOES ANYBODY READ THESE REVIEWS???(like whoeveris responsible for hiring/firing these morons???) It can't be rocket science to figure out how to deliver the mail to the correct mailbox. I have never gotten a straight answer or follow thru on anything these people have told me. Once the then-postmaster (and who that happens to be that week changes depending on who yu talk to) told me not to eve put outgoing mail in my box on a Thursday, because that's when the substitutes work, and they will just leave it in the mailbox. And don't try to get a refrigerated package delivered before it turns to a hot pack. It ain't gonna happen. Better off to use people who know what they're doing, like fedex or UPS.


Asked to have nail forwarded. Called as backup and was assured the Postal service would honor request for one tear. Still have not sold house Mt. Airy. Renewed car registration as resident of Maryland and have yet to get new stickers.


This is the worst post office in the area. I went in a month ago to have the lock on my mailbox for my apartment changed. The lady said someone will take care of it within 3 days and they would let me know which box was mine--still hasn't happened. Went back in nearly 2 weeks ago and waited 25 minutes for the post master to walk out of her office to discuss the situation earlier. She said she'd take care of it that day and give me a call to let me know which box was mine. Two f***ing weeks later and they still have done anything and they refuse to pick up their phones. This office is pathetic and has the worst service I have ever experienced in my entire life.


We are constantly getting other people's mail, very annoying. The last time I checked, I'm not a postal delivery person. I leave the mail in my mail box, put the flag up and the postal carrier still leaves the wrong addressed mail in our mail box. Not sure why it's so hard. I wasn't aware that mail got delivered at 8pm at night either...


Worst post office ever. They broke my mailbox, leave packages in the yard or they lie and don't even deliver them even though they say they tried.


Mail has been stolen from residents along Flag Marsh Road!


We've been getting other peoples mail. So have my neighbors. Not just our neighbors mail either, like addresses 3 or 5 miles away according to Google GPS.

* is not a part of, or affiliated with, the official United States Postal Service (USPS).