Passport Application Services - Mechanicsburg 40 S Main St Mechanicsburg, OH 43044 Phone : (937) 834-2695 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Post Office - Mechanicsburg 40 S Main St Mechanicsburg, OH 43044 Phone : (937) 834-2695 Post Office - Mechanicsburg Business Category Post Offices Toll-Free           (800) ASK-USPS