Passport Application Services - Glen Arm 12112 Long Green Pike Glen Arm, MD 21057 Phone : (410) 592-9658 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Fax           (410) 592-8793 Post Office - Glen Arm 12112 Long Green Pike Glen Arm, MD 21057 Phone : (410) 592-9658 Post Office - Glen Arm Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (410) 592-8793