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United States Postal Service

Map & Directions
(3 Reviews)

401 Church St, O Fallon, MO 63366

(800) 275-8777

Today: 8:30 am - 6:00 pm
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General Info
Visit your local Post Office at 401 Church St! The Postal Service mission is to provide a reliable, efficient, trusted and affordable universal delivery service that connects people and helps businesses grow. The U.S. Postal Service is the only delivery service that reaches every address in the nation: 155 million residences, businesses and Post Office Boxes. With more than 31,600 retail locations and the most frequently visited website in the federal government, the Postal Service delivers 47 percent of the world’s mail.

Regular Hours


Extra Phones

Phone: (636) 272-3811

Fax: (651) 456-6627

Deliveries, Shipping, USPS
Post Offices, Packaging Materials, Mail & Shipping Services, Mailbox Rental
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Bonnie S.



Let's just say that I avoid going into the post office as much as possible. Lines are long, clerks are slow and not very friendly. But my concern is with the letter carriers delivering to our house. We had a wonderful lady for a long time whom I didn't get to say 'goodbye' to. When her replacement began I asked if our previous lady was ok. She mumbled a response that I could not understand. I wanted to just say 'welcome' but she was already driving off. She drove way too fast for an area with 25 mph. She'd obviously hadn't got her deliveries right because we'd see her zipping back down the same street on numerous days. All of our day's mail would end up in someone else's mailbox. People on our same street would walk our mail over later that day or the next. We have done the same for them. This was beyond just ending up in a next door neighbor's box. Then we had a male carrier on weekends who did a fine job. Now we have another carrier who is not suited for this job. We are missing 4 items (that we know of). All are thin, business postcards, glossy material like company newsletters and probably got stuck to other mail, just not ours. All my husband's magazines arrive not just bent to fit in our box but with actual creases. Neighbors have complained about the same problem. She stops her mail truck blocking traffic and sits with no rear lights flashing so we don't know if we should go around her or wait til she moves. The misplaced mail is an ongoing problem. I can understand when it's addressed to another street with the same house number, but today's mail was not like that. I don't even know where the street is. I'll just put it back in my mailbox for the mail carrier to pick up tomorrow. We would appreciate these inexperienced carriers to be more courteous, follow the rules of the road and get a pair of reading glasses. We live in the Lake St Louis area.

Richard K.



What the hell they just pass the mailbox and don't deliver i follow the 10-15 feet mailbox vehicle rule i expect them to do the same and now my neighbor is now complaining because of my car!

Linda L.



The lady (I think her name is Celeste,) who handles walkin's with purchase of stamps and helps with packaging, was really a great help to me. I had been in there previously to check the packaging sizes and I couldn't find one I could use, Celeste told me to bring in the package and she would help me. Today, I took it in and she took care of it for me.

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