United States Government--post Offices 237 Eleanor Pierron, IL 62273 Phone : (618) 654-7214 Business Category Post Offices Government Offices & Public Schools Post Office - Pierron 237 Illinois Route 143 Pierron, IL 62273 Phone : (618) 654-7214 Post Office - Pierron Business Category Post Offices Toll-Free           (800) ASK-USPS