Thornton Post Office

NOTICE: The Postal Service is an essential government service, and will remain open wherever possible.

8804 Washington St, Thornton, CO 80229

Contact Numbers

Phone: 303-227-7386
Fax: 303-287-8679
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 5:30pm
Tuesday 5:30pm
Wednesday 5:30pm
Thursday 5:30pm
Friday 5:30pm
Saturday 4:30pm
Sunday Closed

Bulk Mail Acceptance Hours

Monday 5:00am - 5:00pm
Tuesday 5:00am - 5:00pm
Wednesday 5:00am - 5:00pm
Thursday 5:00am - 5:00pm
Friday 5:00am - 5:00pm
Saturday 5:00am - 4:00pm
Sunday Closed

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

  • Bulk Mail Acceptance
  • Bulk Mail Account Balance
  • Bulk Mail New Permit
  • Burial Flags
  • Business Line
  • Business Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Sure Money
  • 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:

North Pecos
1411 Cortez St
1.5 miles away

850 W 112th Ave
1.9 miles away

11887 Washington St
2.2 miles away

3051 W 105th Ave
2.3 miles away


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Renew of passports information


I live off of 136 and Colorado blvd (partridge village,) ever since our old mailman retired we have experience our Christmas mail this last year coming with envelopes being open, especially if it looked like it could have money or gift cards in them. This new person delivering is one of the most rude and obnoxious people I have had the pleasure of interacting with, he comes speeding into our cul de sac and almost hit my wife whom was pulling out and then yells obscenity’s to witch my wife heard. This person needs be looked into as soon as possible. I have be looking for some help with this situation for some time now and have not been able to locate any number of somebody to report this. Please respond ASAP!


I order my medications mail order so I can get a 3 month supply. But this time is the first time I never received my medication. Per Kaiser mail order they state that it was delivered to a parcel locker on 08/29/2019. Kaiser is stating that their tracking orders 920019020455110153500254 and that it was put in a lock box. I would now like to open a case file for this incident. Can you please let me know what and where to file a case. Thank you, Kari Manteufel


I mailed a bill payment to North Washington Street Water & Sanitation District on 3/12/19. I am being charged for non-payment for March, and I think my bill payment has to be at your Post Office. This type of mishap happened to me 2 years ago - twice, and I am afraid if it is going to happen to me again. I am at your mercy and hope you locate that bill.


My P.O box was closed for overfill yet I have complained for years about mail going to my box that did not belong to my HH. This is ridiculous.


Me nor Rechina Kimball have been receiving our mail we sent in change of address forms and documents to show that our address has changed and our mail is still going to our old address and we would like to know where our packages have gone because there our missing.


package from m pillow was told at post office awaiting delivery still not received, the my pillow is at post office according to their customer services, i still have bot been delivered as of today. Could you please check on this and let me know if you do actually have it there.


Have tried to call Thornton CO post office for 3 months (303-227-7376), nobody ever answers and it just rings and rings until it cuts to a sound similar to a fax machine. Today, I tried to call the 1-800-275-8777 number to see if they could help me out. After going through the lengthy automated system, it told me I would be on hold for 7-11 minutes. I am currently sitting at 20 minutes. I want my postal carrier to know that "community" post boxes have larger openings on the carrier's side than they do on the resident's side and that I often can't get my mail out because it is just shoved into the receptacle. I currently have a small box stuck in my post box because it's too wide to be removed. Last month I had to mangle and mash a similar package in order to get it out of the post box. At 22:47, the 800-number finally said, "please continue to hold." At this rate, it's obvious that the notion of "customer service" does not apply to the United States Post Office. I don't think I should have to take time off of work to make contact with the post office to get such concerns taken care of. I have now been on hold longer than 25:30. I am hanging up with no resolution to this problem.


Alllllll of my mail doesn't get delivered !!! Not one piece of it. It's the holidays and this place won't answer their phone nor do they deliver my mail properly ... it's horrible not being able to rely on the postal service for my bills and cards from loved ones. Thank you for nothing.

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