Post Offices

Post Offices in & near O'Fallon, Missouri. Operating hours, locations, phone/fax number, services information.

O Fallon Post Office

Post Office in O Fallon, Missouri on Church St. Operating hours, phone number, services information, and other locations.

Address: 401 Church St, O Fallon, MO 63366
Phone: 636-272-3811
Fax: 651-456-6627
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Retail Hours

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

Lobby Hours

Monday 5:15pm
Tuesday 5:15pm
Wednesday 5:15pm
Thursday 5:15pm
Friday 5:15pm
Saturday 2:15pm
Sunday Closed

Last Collection Times

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

Saint Peter Post Office

Address: 7055 Mexico Rd, Saint Peters, MO 63376
Phone: 636-397-9022
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Cottlevill Post Office

Address: 5323 Highway N, Cottleville, MO 63338
Phone: 636-447-6537
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Saint Charles South Post Office

Address: 1600 Woodstone Dr, Saint Charles, MO 63303
Phone: 636-922-2077
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Wentzvill Post Office

Address: 762 Luetkenhaus Blvd, Wentzville, MO 63385
Phone: 636-327-3550
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457

Old Monr Post Office

Address: 104 Sycamore St, Old Monroe, MO 63369
Phone: 636-665-5486
Toll-Free: 1-800-Ask-USPS® (275-8777)
TTY: 877-889-2457