St. Clair County, MO mailboxes and post offices

There are 17 United States Postal Service post boxes and offices available to the public in St. Clair County. You can use any one of these locations to mail your letter or package via USPS. For additional collection boxes in neighboring communities, see the list of mailboxes in Missouri.

Post Offices and Mailboxes in Missouri

Where to buy postage stamps in St. Clair County, MO

Mailbox in Post Office Lobby
407 S Main St
Directions
Mailbox in Post Office Lobby
318 W Osage Ave
Directions
Public Collection Box
1109 S Highway 39
Directions
Public Collection Box
118 E 4 Th St
Directions