Passport Application Services - Arnold 1521 Ritchie Hwy Arnold, MD 21012 Phone : (410) 757-8802 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Fax           (410) 757-9008 Post Office - Arnold 1521 Ritchie Hwy Arnold, MD 21012 Phone : (410) 757-8802 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (410) 757-9008