Passport Application Services - Parkton 645 Happy Ln Parkton, MD 21120 Phone : (410) 357-9255 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Fax           (410) 357-9066 Post Office - Parkton 645 Happy Ln Parkton, MD 21120 Phone : (410) 357-9255 Post Office - Parkton Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (410) 357-9066