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.

Street View Image of Belleville Post Office in Belleville, IL

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

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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
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Street View Image of Dutch Hollow Post Office in Belleville, IL

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

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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
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Street View Image of Caseyville Post Office in Caseyville, IL

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

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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

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Street View Image of Dupo Post Office in Dupo, IL

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

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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

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Street View Image of East Carondelet Post Office in East Carondelet, IL

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

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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

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Street View Image of Alorton Post Office in East Saint Louis, IL

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

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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

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Street View Image of Cahokia Post Office in East Saint Louis, IL

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

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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

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Street View Image of East Saint Louis Post Office in East Saint Louis, IL

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

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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

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Street View Image of Edgemont Post Office in East Saint Louis, IL

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

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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

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Street View Image of National Stock Yards Post Office in East Saint Louis, IL

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

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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

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Street View Image of Fairview Heights Post Office in Fairview Heights, IL

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

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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

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Street View Image of Freeburg Post Office in Freeburg, IL

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

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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

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Street View Image of Lebanon Post Office in Lebanon, IL

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

  • Stamps.com logo
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Street View Image of Lenzburg Post Office in Lenzburg, IL

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

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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

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Street View Image of Lovejoy Post Office in Lovejoy, IL

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

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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

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Street View Image of Marissa Post Office in Marissa, IL

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

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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

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Street View Image of Mascoutah Post Office in Mascoutah, IL

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

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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

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Street View Image of Millstadt Post Office in Millstadt, IL

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

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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

  • Stamps.com logo
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Street View Image of New Athens Post Office in New Athens, IL

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

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Street View Image of O Fallon Post Office in O Fallon, IL

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

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Street View Image of Saint Libory Post Office in Saint Libory, IL

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

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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

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Street View Image of Scott Air Force Base Post Office in Scott Air Force Base, IL

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

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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

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Street View Image of Smithton Post Office in Smithton, IL

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

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Street View Image of Summerfield Post Office in Summerfield, IL

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

  • Stamps.com logo
    Buy postage online
    Discounted USPS and UPS rates of up to 84%.
    Promo code
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    $100 value