Howard County Landfill 2350 Marriottsville Rd Marriottsville, MD 21104 Phone : (410) 313-5410 Business Category Government Offices-County Legislative Bodies Handy Numbers At A Glance--landfill 2350 Marriottsville Rd Marriottsville, MD 21104 Phone : (410) 313-5410 Business Category Social Service & Welfare Organizations Community Services Howard County--public Works Department Of, Bureau Of Waste Management, Landfill Marriottsville Road Ellicott City, MD 21043 Phone : (410) 313-5410 Business Category Government Offices-County Government Offices & Public Schools Howard County--dump-call Alpha Ridge Landfill Ellicott City, MD 21043 Phone : (410) 313-5410 Business Category Government Offices-County Government Offices & Public Schools Howard County--landfill Marriottsville Rd Ellicott City, MD 21043 Phone : (410) 313-5410 Business Category Government Offices-County Government Offices & Public Schools