United States--postal Service, Dauphin 204 Allegheny St Dauphin, PA 17018 Phone : (717) 921-2101 Business Category Government Offices-Federal Government Offices & Public Schools Post Office - Dauphin 204 Allegheny St Dauphin, PA 17018 Phone : (717) 921-2101 Post Office - Dauphin Business Category Post Offices Toll-Free           (800) ASK-USPS