- Hair Braiding, Frederick
- Hair Care & Treatment, Frederick
- Hair Care Products, Frederick
- Hair Care Professionals, Frederick
- Hair Replacement, Frederick
- Hair Replacement & Extensions, Frederick
- Hair Weaving, Frederick
- Hallmark Gift Shop, Frederick
- Hamburger Restaurants, Frederick
- Handicapped Services, Frederick
- Hardware Stores, Frederick
- Hardwood Floors, Frederick
- Hauling And Shipping, Frederick
- Head Start Centers, Frederick
- Health & Diet Food Products - Wholesale & Retail, Frederick
- Health & Fitness Program Consultants & Trainers, Frederick
- Health & Medical, Frederick
- Health & Nutrition Consultants, Frederick
- Health And Medical Centers, Frederick
- Health Care Information & Services, Frederick
- Health Care Management, Frederick
- Health Care Plans, Frederick
- Health Clubs & Gymnasiums, Frederick
- Health Consulting Services, Frederick
- Health Insurance, Frederick
- Healthcare Consultants, Frederick
- Healthcare Providers, Practitioners & Professionals, Frederick
- Hearing & Speech Clinics, Frederick
- Hearing Aid Acousticians, Frederick
- Hearing Aid Practitioners, Frederick
- Hearing Aid Repair, Frederick - Hearing Devices
- Hearing Aids & Assistive Devices & Supplies, Frederick - Hearing Devices
- Hearing Aids Manufacturers, Frederick
- Hearing Testing, Assessment & Hearing Aids, Frederick - Hearing Impaired Services
- Heating & Air Conditioning Equipment, Parts & Supplies, Frederick - HVAC Suppliers & Companies
- Heating & Air Conditioning Manufacturers, Frederick
- Heating & Air Conditioning Repair, Installation & Service Contractors, Frederick - HVAC Contractors
- Heating & Air-Conditioning Contractors, Frederick - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating & Plumbing Supplies Stores, Frederick
- Heating Contractors, Frederick - Heating Systems - Installation & Repair
- Heating Equipment & Systems - Cleaning & Repair, Frederick - Heat Pump, Incinerator, Heat Exchanger, Heaters, Etc
- Heating, Ventilating & Air Conditioning Engineer, Frederick - HVAC Engineers
- Heating, Ventilating & Air Conditioning Systems Cleaning, Frederick - HVAC Systems
- Heavy Equipment Hauling, Frederick
- Hematologists, Frederick - Blood Doctors, Physicians & Surgeons (Hematology)
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- Highway & Street Construction Contractors, Frederick - Road Construction
- Highway Surfacing & Paving Contractors, Frederick - Pavers - Paving Companies
- Historical Places & Services, Frederick
- Hobby & Model Shops & Supplies, Frederick
- Holding Companies, Frederick
- Holistic Health Practitioner, Frederick - Holistic Medicine
- Home & Consumer Electronics & Appliances Rental, Frederick
- Home & Garden Products, Frederick
- Home Additions & Remodeling Contractors, Frederick - Refinishing & Restoration
- Home Appliance Repair, Sales & Services, Frederick
- Home Decor Accessories & Supplies, Frederick - Wholesale & Suppliers
- Home Decor Stores, Frederick - Home Decorations, Supplies & Accessories
- Home Furnishings, Frederick - Home Decor Stores, Items & Accessories
- Home Health Care, Frederick - Agencies & Services
- Home Security Companies & Services, Frederick - Home Alarm Systems & Security Systems, Video Surveillance System, Etc
- Homeowners Insurance, Frederick
- Homes Mentally Handicapped, Frederick
- Horse Breeders & Dealers, Frederick
- Horse Dealers, Frederick
- Horse Stables, Frederick
- Horseback Riding Lessons & Instruction, Frederick - Horse Riding School
- Horseshoers, Frederick
- Hospital & Medical Insurance Plans, Frederick
- Hospital Equipment Oxygen Therapy, Frederick
- Hospital, Dental & Medical Equipment & Supplies, Frederick
- Hospitals, Frederick
- Hot Dog Restaurants, Frederick
- Hot Tubs, Saunas, Whirlpools & Spas Supplies, Equipment & Accessories, Frederick
- Hot Water Heater Installation & Repair, Frederick - Gas & Electric Water Heater Services
- Hotel & Motel Management, Frederick
- Hotel Motel & Resort Reservations, Frederick
- Hotels & Motels, Frederick
- House & Apartment Cleaning, Frederick
- House & Building Washing & Maintenance Exterior, Frederick
- House Cleaning & Maid Service, Frederick
- Household & Commercial Appliances Stores, Frederick
- Household Cutlery Stores, Frederick
- Household Goods & Furniture Storage , Frederick
- Household Products, Frederick
- Household Safety & Protective Merchandise, Frederick
- Household Services, Frederick
- Housing Authority, Frederick
- Humane Societies, Frederick
- Hunan Restaurants, Frederick
- Hypnotherapists, Frederick - Hypnotherapy (Hypnosis) Doctors & Physicians
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