United States Government--postal Service, Millerstown Ofc 12 N Market St Millerstown, PA 17062 Phone : (717) 589-3154 Business Category Government Offices-Federal Government Offices & Public Schools Post Office - Millerstown 12 N Market St Millerstown, PA 17062 Phone : (717) 589-3154 Business Category Post Offices Toll-Free           (800) ASK-USPS