Post Office - Loysville 3555 Shermans Valley Rd Loysville, PA 17047 Phone : (717) 789-3412 Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--postal Service, Loysville Ofc Loysville, PA 17047 Phone : (717) 789-3412 Business Category Government Offices-Federal Government Offices & Public Schools