Gaithersburg Post Office

21 S Summit Ave, Gaithersburg, MD 20877

Contact Numbers

Phone: 301-208-3701
Fax: 301-208-3707
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Lobby Hours
PO Box Access Available

Monday 24 hours
Tuesday 24 hours
Wednesday 24 hours
Thursday 24 hours
Friday 24 hours
Saturday 24 hours
Sunday 24 hours

Last Collection Times

Monday 5:00pm
Tuesday 5:00pm
Wednesday 5:00pm
Thursday 5:00pm
Friday 5:00pm
Saturday 1:00pm
Sunday Closed

*This facility does not process US Passports applications or renewals. Check nearby locations below.

  • Burial Flags
  • Business Line
  • Business Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • General Delivery
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Lobby has Copier
  • Lot Parking

Visit our Links Page for Holiday Schedule, Change of Address, Hold Mail/Stop Delivery, PO Box rentals and fees, and Available Jobs.

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

Nearby Post Offices:

Washington Grove
111 Washington Grove Ln
0.6 mile away

Suburban Window Scv
16501 Shady Grove Rd
1.0 miles away

Diamond Farms
23 Firstfield Rd
1.4 miles away

Montgomery Village
10079 Stedwick Rd
1.4 miles away


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How can.I get a change of address card ?


To Whom it may concern: I sent a christmas card on Dec 23,2020 certified and it was never received yet, I went on line and it says in transit since Jan 11,2021 where is my mail.


I am looking for a package delivered to you by UPS on march 29. Ups tracking number is 1ZV2611RYW01593282. IT must be delivered to Eduardo Izurieta 1732 Glastonberry Rd. Potomac MD 20854. I need information about it ASAP. Original sender is Hollister Co.


UPS is United Parcel Service USPS is United States Postal Service
• Replied to Eduardo Izurieta


my package has been delayed to be delivered. it was sent on 18th may 2017 to zambia on the following address. mukulila mazimba 6191 zambezi way, riverside-kitwe coming from kwaw egonli 72 statect gaithersburg md 20877-3445 usa. please tell me were my package is. track number LC985989018US

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