United States Government--post Office, Zip Code Information Jamestown, PA 16134 Phone : (724) 932-5245 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools Post Office - Jamestown 119 Liberty St Jamestown, PA 16134 Phone : (724) 932-5245 Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--post Office 119 Jamestown Liberty St Jamestown, PA 16134 Phone : (724) 932-5245 Business Category Government Offices-Federal Post Offices Government Offices & Public Schools