O Fallon Post Office

401 Church St, O Fallon, MO 63366

Contact Numbers:

Phone: 636-272-3811
Fax: 651-456-6627
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Bulk Mail Acceptance Hours

Monday-Friday 9:00am - 12:30pm, 1:30pm - 4:00pm
Saturday-Sunday Closed

Pickup Services Hours

Monday-Friday 8:30am - 6:00pm
Saturday 9:00am - 2:00pm
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 5:15pm
Saturday 2:15pm
Sunday Closed

Self-Service Kiosk Availability

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

Carrier Facility Hours

Monday-Friday 8:30am - 4:30pm
Saturday 8:30am - 1:30pm
Sunday Closed

Passport Acceptance Hours

Monday-Friday 9:00am - 4:00pm
Saturday 9:00am - 1:00pm
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

Passport Photo Hours

Monday-Friday 9:00am - 4:00pm
Saturday 9:00am - 1:00pm
Sunday Closed

Global Express Guaranteed® Hours

Monday-Friday 8:30am - 6:00pm
Saturday 9:00am - 2:00pm
Sunday Closed

  • Bulk Mail Acceptance
  • Bulk Mail Account Balance
  • Bulk Mail New Permit
  • 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)
  • Passport Acceptance
  • Passport Photo
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Priority Mail International®
  • 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:

5323 Highway N
3.3 miles away

Saint Peters
7055 Mexico Rd
3.3 miles away

Old Monroe
104 Sycamore St
5.2 miles away

Saint Charles South
1600 Woodstone Dr
5.4 miles away


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We have not received our mail since last Wednesday, when we received it around 8 pm. (I got injured going out at night to retrieve it!) Our streets were completely clear of ice on Saturday and we STILL received no mail and have not had our outgoing mail picked up. I receive a busy signal when I call. I tried an alternative number and got no answer. This is why I never order prescriptions by mail. Because of this horrible service, I will never ship anything through USPS again either.


We have not been receiving our mail. The postal carrier sometime passes up this street. We go days without receiving any mail! I complained in person about this yesterday and came home only to discover that we again did not have mail. This is a regular occurrence. I will take this to the Postal Inspectors because I believe at this point that our mail is being stolen within your system. I tried calling the number and it disconnected. Insurance companies want us to get medicine by mail - we'd end up dying because we don't get regular mail service.


SO my mail has been on hold and it ended today and should have been delivered today. But instead I received my next door neighbors mail instead of my mail which has been on hold for a week. So i called the 272-3811 number. That person was not very interested in helping me. It was like I will check on it--no, I want to know where it is and can you call me back. She was going to check to see if it was still in the post office, if not, call the carrier and then call me back.What's your name...did not ask for my phone number..I had to give it to her. She did ask for my street address. She finally called me back saying she has no idea where my mail is and was unable to contact the carrier. So now what????


I'm shocked they answered the phone. I've been calling for over an hour-at least 8 times.... never answer
• Replied to Royce Joggerst

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