United States Government--post Offices, Hartstown Office Hartstown, PA 16131 Phone : (814) 382-8254 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Hartstown 6768 Center St Hartstown, PA 16131 Phone : (814) 382-8254 Business Category Post Offices Toll-Free           (800) ASK-USPS