Us Government Departments--postal Service Us, Maryland Post Offices, Maryland Line 21400 York Rd Freeland, MD 21053 Phone : (410) 343-3064 Business Category Post Offices Government Offices & Public Schools Post Office - Maryland Line 21400 York Rd Maryland Line, MD 21105 Phone : (410) 343-3064 Post Office - Maryland Line Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (410) 347-4289