Automated Postal Center - Harmony 217 Mercer St Harmony, PA 16037 Phone : (724) 452-8333 Business Category Automated Postal Centers Toll-Free           (800) ASK-USPS Fax           (724) 452-0567 Post Office - Harmony 217 Mercer St Harmony, PA 16037 Phone : (724) 452-8333 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (724) 452-0567