Passport Application Services - Clarksville 12411 Auto Dr Clarksville, MD 21029 Phone : (443) 535-0742 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Fax           (410) 531-0946 Post Office - Clarksville 12411 Auto Dr Clarksville, MD 21029 Phone : (443) 535-0742 Post Office - Clarksville Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (410) 531-0946