U S Government--postal Service, Newton Hamilton Mount Union, PA 17066 Phone : (814) 542-4455 Business Category Government Offices-Federal Government Offices & Public Schools United States Government--postal Service, Newton Hamilton Wayne St Mount Union, PA 17066 Phone : (814) 542-4455 Business Category Government Offices-Federal Government Offices & Public Schools Post Office - Newton Hamilton 15 Wayne St Newton Hamilton, PA 17075 Phone : (814) 542-4455 Post Office - Newton Hamilton Business Category Post Offices Toll-Free           (800) ASK-USPS