United States Government--postal Service, Harrisburg Stations & Branches, Offices, Annville 51 N Lancaster St Annville, PA 17003 Phone : (717) 867-4821 Business Category Government Offices & Public Schools Post Office - Annville 51 N Lancaster St Annville, PA 17003 Phone : (717) 867-4821 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Toll-Free           (800) ASK-USPS