U S Government--postal Service, Piasa Medora, IL 62063 Phone : (618) 729-3850 Business Category Government Offices & Public Schools Post Office - Piasa 1276 Route 16 Piasa, IL 62079 Phone : (618) 729-3850 Post Office - Piasa Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Offices Piasa, IL 62079 Phone : (618) 729-3850 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools