According to our records, this business is located at 1111 S Lincoln Ave. in O Fallon (in St Clair County), Illinois 62269, the location GPS coordinates are: 38.5818838 (latitude), -89.9119561 (longitude). US Post Office is categorized under Post Offices (SIC code 4311). Known organization branch manager is Hariett Harris. You can contact the company by phone at (618) 632-4691.