Passport Application Services - Mckeesport 850 Walnut St Mckeesport, PA 15134 Phone : (412) 672-9722 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Fax           (412) 672-8935 Post Office - Mckeesport 850 Walnut St Mckeesport, PA 15134 Phone : (412) 672-9722 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (412) 672-8935