Post offices in the county of St. Clair, IL
Use this page to find the post offices in your county that open earliest or stay open latest. The open hours listed are for the post office's retail hours, which means the hours in which a postal service employee is available at the counter to help with mailings and other services. Oftentimes lobbies are open extended hours, and you are able to check your PO box, drop off packages, or use the self-service APC machine to buy postage. The list below is first sorted alphabetically by city, then by post office name. Street View photos of post offices are shown when available. Please contact us if you find an error, so that we can correct it.
Belleville Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 120 W Washington St Belleville, IL 62220-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 6:00 PM Tuesday 9:00 AM 6:00 PM Wednesday 9:00 AM 6:00 PM Thursday 9:00 AM 6:00 PM Friday 9:00 AM 6:00 PM Saturday 8:30 AM 3:00 PM Sunday Closed - Phone
- 618-233-0390
- Fax
- 618-233-9624
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Dutch Hollow Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 5731 Mount Pleasant Ln Belleville, IL 62223-9998 Get directions
- Open hours
Day Open Close Monday 8:30 AM 6:30 PM Tuesday 8:30 AM 6:30 PM Wednesday 8:30 AM 6:30 PM Thursday 8:30 AM 6:30 PM Friday 8:30 AM 6:30 PM Saturday 8:30 AM 3:00 PM Sunday Closed - Phone
- 618-397-6616
- Fax
- 618-397-7468
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Caseyville Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 113 S Long St Caseyville, IL 62232-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 5:00 PM Tuesday 9:00 AM 5:00 PM Wednesday 9:00 AM 5:00 PM Thursday 9:00 AM 5:00 PM Friday 9:00 AM 5:00 PM Saturday 9:00 AM 11:30 AM Sunday Closed - Phone
- 618-344-4594
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Dupo Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 116 Emma Ave Dupo, IL 62239-9998 Get directions
- Open hours
Day Open Close Monday 10:00 AM 1:00 PM 2:00 PM 5:00 PM Tuesday 10:00 AM 1:00 PM 2:00 PM 5:00 PM Wednesday 10:00 AM 1:00 PM 2:00 PM 5:00 PM Thursday 10:00 AM 1:00 PM 2:00 PM 5:00 PM Friday 10:00 AM 1:00 PM 2:00 PM 5:00 PM Saturday 8:30 AM 12:00 PM Sunday Closed - Phone
- 618-286-3917
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
East Carondelet Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 824 State St East Carondelet, IL 62240-9998 Get directions
- Open hours
Day Open Close Monday 7:30 AM 10:30 AM 11:30 AM 2:30 PM Tuesday 7:30 AM 10:30 AM 11:30 AM 2:30 PM Wednesday 7:30 AM 10:30 AM 11:30 AM 2:30 PM Thursday 7:30 AM 10:30 AM 11:30 AM 2:30 PM Friday 7:30 AM 10:30 AM 11:30 AM 2:30 PM Saturday Closed Sunday Closed - Phone
- 618-286-4446
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Alorton Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 4825 Bond Ave East Saint Louis, IL 62207-9998 Get directions
- Open hours
Day Open Close Monday 9:30 AM 1:30 PM Tuesday 9:30 AM 1:30 PM Wednesday 9:30 AM 1:30 PM Thursday 9:30 AM 1:30 PM Friday 9:30 AM 1:30 PM Saturday 9:30 AM 11:30 AM Sunday Closed - Phone
- 618-874-3736
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Cahokia Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 801 Range Ln East Saint Louis, IL 62206-9998 Get directions
- Open hours
Day Open Close Monday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Tuesday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Wednesday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Thursday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Friday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Saturday 8:30 AM 12:30 PM Sunday Closed - Phone
- 618-332-3571
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
East Saint Louis Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 950 Missouri Ave East Saint Louis, IL 62201-9998 Get directions
- Open hours
Day Open Close Monday 8:30 AM 5:00 PM Tuesday 8:30 AM 5:00 PM Wednesday 8:30 AM 5:00 PM Thursday 8:30 AM 5:00 PM Friday 8:30 AM 5:00 PM Saturday 8:30 AM 12:30 PM Sunday Closed - Phone
- 618-875-0200
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Edgemont Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 8701 State St East Saint Louis, IL 62203-9997 Get directions
- Open hours
Day Open Close Monday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Tuesday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Wednesday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Thursday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Friday 8:30 AM 1:30 PM 3:00 PM 5:00 PM Saturday 8:30 AM 12:30 PM Sunday Closed - Phone
- 618-398-3594
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
National Stock Yards Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 3900 Collinsville Rd East Saint Louis, IL 62201-9997 Get directions
- Open hours
Day Open Close Monday 12:30 PM 4:30 PM Tuesday 12:30 PM 4:30 PM Wednesday 12:30 PM 4:30 PM Thursday 12:30 PM 4:30 PM Friday 12:30 PM 4:30 PM Saturday Closed Sunday Closed - Phone
- 618-874-0458
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Fairview Heights Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 10850 Lincoln Trl Unit 20 Fairview Heights, IL 62208-9998 Get directions
- Open hours
Day Open Close Monday 8:30 AM 5:00 PM Tuesday 8:30 AM 5:00 PM Wednesday 8:30 AM 5:00 PM Thursday 8:30 AM 5:00 PM Friday 8:30 AM 5:00 PM Saturday 8:30 AM 12:30 PM Sunday Closed - Phone
- 618-397-5044
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Freeburg Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 3 S Belleville St Freeburg, IL 62243-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 5:00 PM Tuesday 9:00 AM 5:00 PM Wednesday 9:00 AM 5:00 PM Thursday 9:00 AM 5:00 PM Friday 9:00 AM 5:00 PM Saturday 8:30 AM 10:00 AM Sunday Closed - Phone
- 618-539-3191
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Lebanon Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 201 E Saint Louis St Lebanon, IL 62254-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 12:00 PM 1:00 PM 4:00 PM Tuesday 9:00 AM 12:00 PM 1:00 PM 4:00 PM Wednesday 9:00 AM 12:00 PM 1:00 PM 4:00 PM Thursday 9:00 AM 12:00 PM 1:00 PM 4:00 PM Friday 9:00 AM 12:00 PM 1:00 PM 4:00 PM Saturday 9:00 AM 11:00 AM Sunday Closed - Phone
- 618-537-4439
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Lenzburg Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 312 N Charles St Lenzburg, IL 62255-9998 Get directions
- Open hours
Day Open Close Monday 7:30 AM 11:30 AM Tuesday 7:30 AM 11:30 AM Wednesday 7:30 AM 11:30 AM Thursday 7:30 AM 11:30 AM Friday 7:30 AM 11:30 AM Saturday 8:00 AM 9:00 AM Sunday Closed - Phone
- 618-475-3309
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Lovejoy Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 413 S 3rd St Lovejoy, IL 62059-9998 Get directions
- Open hours
Day Open Close Monday 7:30 AM 11:30 AM Tuesday 7:30 AM 11:30 AM Wednesday 7:30 AM 11:30 AM Thursday 7:30 AM 11:30 AM Friday 7:30 AM 11:30 AM Saturday Closed Sunday Closed - Phone
- 618-874-7993
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Marissa Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 114 N Main St Marissa, IL 62257-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 11:00 AM 1:00 PM 4:00 PM Tuesday 9:00 AM 11:00 AM 1:00 PM 4:00 PM Wednesday 9:00 AM 11:00 AM 1:00 PM 4:00 PM Thursday 9:00 AM 11:00 AM 1:00 PM 4:00 PM Friday 9:00 AM 11:00 AM 1:00 PM 4:00 PM Saturday 10:00 AM 12:00 PM Sunday Closed - Phone
- 618-295-3051
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Mascoutah Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 18 W Main St Mascoutah, IL 62258-9998 Get directions
- Open hours
Day Open Close Monday 8:30 AM 5:00 PM Tuesday 8:30 AM 5:00 PM Wednesday 8:30 AM 5:00 PM Thursday 8:30 AM 5:00 PM Friday 8:30 AM 5:00 PM Saturday 8:30 AM 11:00 AM Sunday Closed - Phone
- 618-566-2618
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Millstadt Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 20 W White St Millstadt, IL 62260-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 5:00 PM Tuesday 9:00 AM 5:00 PM Wednesday 9:00 AM 5:00 PM Thursday 9:00 AM 5:00 PM Friday 9:00 AM 5:00 PM Saturday 8:30 AM 12:00 PM Sunday Closed - Phone
- 618-476-1717
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
New Athens Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 200 S Benton St New Athens, IL 62264-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 11:00 AM 12:30 PM 3:30 PM Tuesday 9:00 AM 11:00 AM 12:30 PM 3:30 PM Wednesday 9:00 AM 11:00 AM 12:30 PM 3:30 PM Thursday 9:00 AM 11:00 AM 12:30 PM 3:30 PM Friday 9:00 AM 11:00 AM 12:30 PM 3:30 PM Saturday 8:30 AM 9:30 AM Sunday Closed - Phone
- 618-475-3233
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
O Fallon Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 1111 S Lincoln Ave O Fallon, IL 62269-9998 Get directions
- Open hours
Day Open Close Monday 8:30 AM 7:00 PM Tuesday 8:30 AM 7:00 PM Wednesday 8:30 AM 7:00 PM Thursday 8:30 AM 7:00 PM Friday 8:30 AM 7:00 PM Saturday 9:00 AM 4:00 PM Sunday Closed - Phone
- 618-632-4691
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Saint Libory Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 7340 State Route 15 Saint Libory, IL 62282-9998 Get directions
- Open hours
Day Open Close Monday 9:30 AM 12:30 PM 1:30 PM 4:30 PM Tuesday 9:30 AM 12:30 PM 1:30 PM 4:30 PM Wednesday 9:30 AM 12:30 PM 1:30 PM 4:30 PM Thursday 9:30 AM 12:30 PM 1:30 PM 4:30 PM Friday 9:30 AM 12:30 PM 1:30 PM 4:30 PM Saturday 8:45 AM 9:45 AM Sunday Closed - Phone
- 618-768-4972
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Scott Air Force Base Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 404 W Martin St Scott Air Force Base, IL 62225-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 4:00 PM Tuesday 9:00 AM 4:00 PM Wednesday 9:00 AM 4:00 PM Thursday 9:00 AM 4:00 PM Friday 9:00 AM 4:00 PM Saturday 9:00 AM 12:00 PM Sunday Closed - Phone
- 618-256-5942
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Smithton Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 512 S Main St Smithton, IL 62285-9998 Get directions
- Open hours
Day Open Close Monday 9:00 AM 11:30 AM 1:30 PM 4:00 PM Tuesday 9:00 AM 11:30 AM 1:30 PM 4:00 PM Wednesday 9:00 AM 11:30 AM 1:30 PM 4:00 PM Thursday 9:00 AM 11:30 AM 1:30 PM 4:00 PM Friday 9:00 AM 11:30 AM 1:30 PM 4:00 PM Saturday 9:00 AM 11:00 AM Sunday Closed - Phone
- 618-234-8680
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value
Summerfield Post Office is currently closed
For parking and list of services available, visit the official USPS page for post this post office location.
- Post office address
- 101 E Park St Summerfield, IL 62289-9998 Get directions
- Open hours
Day Open Close Monday 12:30 PM 4:30 PM Tuesday 12:30 PM 4:30 PM Wednesday 12:30 PM 4:30 PM Thursday 12:30 PM 4:30 PM Friday 12:30 PM 4:30 PM Saturday 10:00 AM 10:30 AM Sunday Closed - Phone
- 618-934-3461
- Offer
- Discounted USPS and UPS rates of up to 84%.
- Promo code
- MAIL100 $100 value