Passport Application Services - Riva 3123 Riva Rd Riva, MD 21140 Phone : (410) 956-2187 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Fax           (410) 956-1999 Post Office - Riva 3123 Riva Rd Riva, MD 21140 Phone : (410) 956-2187 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (410) 956-1999