Post Office - Wampum 414 Beaver St Wampum, PA 16157 Phone : (724) 535-4251 Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--u S Postal Service, Wampum 414 Beaver St Wampum, PA 16157 Phone : (724) 535-4251 United States Government--u S Postal Service, Wampum Business Category Government Offices-Federal Business Consulting Services National Security Recruiting Us Armed Forces Government Offices & Public Schools