United States Government--postal Service, Mapleton Depot Main & Church Sts Mount Union, PA 17066 Phone : (814) 542-9837 Business Category Government Offices-Federal Government Offices & Public Schools Post Office - Mapleton Depot 1 Main St Mapleton Depot, PA 17052 Phone : (814) 542-9837 Business Category Post Offices Toll-Free           (800) ASK-USPS