St Charles County Post Offices


Click on the Post Office for all operating hours, servcies, and other information.

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1. Augusta Post Office
237 Ferry St
Augusta, MO 63332
636-228-4888 Today 8:00am - 12:00pm
2. Cottleville Post Office
5323 Highway N
Cottleville, MO 63338
636-447-6537 Today 9:00am - 5:30pmpassport Passports
3. Defiance Post Office
2959 S Highway 94
Defiance, MO 63341
636-987-2407 Today 9:00am - 11:00am,
1:00pm - 4:00pm
4. Flinthill Post Office
5025 Highway P
Flinthill, MO 63346
636-327-3070 Today 8:15am - 12:15pm
5. Foristell Post Office
100 Town Centre Ct
Foristell, MO 63348
636-673-2693 Today 8:30am - 11:30am,
1:00pm - 4:30pm
6. New Melle Post Office
30 W Highway D Ste 107
New Melle, MO 63365
636-828-5850 Today 9:00am - 12:00pm,
1:00pm - 4:00pm
7. O Fallon Post Office
401 Church St
O Fallon, MO 63366
636-272-3811 Today 8:30am - 6:00pmpassport Passports
8. Portage Des Sioux Post Office
1375 Clark St
Portage Des Sioux, MO 63373
636-899-0033 Today 7:00am - 11:00am
9. Saint Charles Post Office
1890 1st Capitol Dr
Saint Charles, MO 63301
636-949-2291 Today 8:00am - 6:00pmpassport Passports
10. Saint Charles South Post Office
1600 Woodstone Dr
Saint Charles, MO 63303
636-922-2077 Today 9:00am - 5:00pm
11. Saint Peters Post Office
7055 Mexico Rd
Saint Peters, MO 63376
636-397-9022 Today 8:30am - 6:00pmpassport Passports
12. Wentzville Post Office
762 Luetkenhaus Blvd
Wentzville, MO 63385
636-327-3550 Today 8:30am - 5:30pm
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