Baltimore County Co-op Ext Service 1840 York Rd # J Lutherville, MD 21093 Phone : (410) 666-1020 Baltimore County Co-op Ext Service Business Category Government Offices-County Legislative Bodies Baltimore County--cooperative Extension Service 1840 York Rd Hunt Valley, MD 21065 Phone : (410) 666-1020 Business Category Government Offices-County Government Offices & Public Schools