United States Government Continued--post Offices, Old Zionsville Emmaus, PA 18049 Phone : (610) 966-3106 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Old Zionsville 5831 Kings Hwy S Old Zionsville, PA 18068 Phone : (610) 966-3106 Post Office - Old Zionsville Business Category Post Offices Toll-Free           (800) ASK-USPS