Maryland State Government--transportation Department Of, State Highway Administration, Residence Maintenance Engineer, Howard County Clarksville, MD 21029 Phone : (410) 531-5533 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools State Highway Administration 4401 State Route 32 Dayton, MD 21036 Phone : (410) 531-5533 Business Category Highway & street construction Road Maintenance