U S Government--postal Service Water St Lawn, PA 17041 Phone : (717) 964-3783 Business Category Government Offices-Federal Government Offices & Public Schools United States Government--postal Service, Harrisburg Stations & Branches, Offices, Water Lawn Mount Gretna, PA 17064 Phone : (717) 964-3783 Business Category Government Offices & Public Schools Post Office - Lawn 5575 Elizabethtown Rd Lawn, PA 17041 Phone : (717) 964-3783 Business Category Post Offices Toll-Free           (800) ASK-USPS