Long Beach High School 6101 Old Dobbin Ln Columbia, MD 21045 Phone : (410) 313-6600 Business Category Schools Government Offices-County Schools-Public Schools-Senior High Government Offices & Public Schools Howard County--public School System Ellicott City, MD 21043 Phone : (410) 313-6600 Business Category Schools Government Offices-County Government Offices & Public Schools Howard County--schools, Public School System, Administration Building 10910 State Route 108 Ellicott City, MD 21042 Phone : (410) 313-6600 Business Category Schools Government Offices-County Schools-Public Government Offices & Public Schools Howard County--education Department Ellicott City, MD 21043 Phone : (410) 313-6600 Business Category Schools Government Offices-County Government Offices & Public Schools Howard County--schools Ellicott City, MD 21043 Phone : (410) 313-6600 Business Category Schools Government Offices-County Government Offices & Public Schools