United States Post Office

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This United States Post Office serves the 63366 Zip Code portion of O'Fallon. It is a full service post office but you can skip the postal clerk by using one of the two self-service machines in the lobby. It also rents  PO Boxes  with 24-hour access. Outside there is a drive through lane with mail boxes to drop letters in.  
401 Church St, O Fallon, MO 63366
(636) 281-0721
  • Hours: Mon - Fri,8:30am - 6pm; Sat, 9am - 2pm; Sun, closed
  • Hours: Mon - Fri, 9am - 5pm
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