Child Support Office 101 S Main St Bel Air, MD 21014 Phone : (410) 638-8940 Business Category Social Service & Welfare Organizations Individual & Family Social Services Maryland State Government--human Resources Department Of, Social Services Department Of, Harford County Social Service, Child Support Office 101 S Main St Bel Air, MD 21014 Phone : (410) 638-8940 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools