- Hair Care Professionals, Frederick
- Hardware Stores, Frederick
- Health & Diet Food Products - Wholesale & Retail, Frederick
- Health & Medical, Frederick
- Health And Medical Centers, Frederick
- Health Care Information & Services, Frederick
- Health Clubs & Gymnasiums, Frederick
- Healthcare Providers, Practitioners & Professionals, Frederick
- Heating & Air Conditioning Equipment, Parts & Supplies, Frederick - HVAC Suppliers & Companies
- Heating & Air-Conditioning Contractors, Frederick - HVAC Contractors - Installation, Repair, Replace Service, etc
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- Heating Contractors, Frederick - Heating Systems - Installation & Repair
- Heavy Haul Trucking Companies, Frederick - Heavy Equipment & Machinery Hauling & Transportation
- Home Health Care, Frederick - Agencies & Services
- Homeowners Insurance, Frederick
- Hospitals, Frederick
- Hotels & Motels, Frederick
- House Cleaning & Maid Service, Frederick
- Household & Commercial Appliances Stores, Frederick
- Household Goods & Furniture Storage , Frederick
- Household Services, Frederick
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