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 - 6:00pmTuesday 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 5:15pmTuesday 5:15pm
Wednesday 5:15pm
Thursday 5:15pm
Friday 5:15pm
Saturday 2:15pm
Sunday Closed
Last Collection Times
Monday 9:00am - 4:00pmTuesday 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