- Hamburger Restaurants, Thurmont
- Hardware Stores, Thurmont
- Health & Fitness Program Consultants & Trainers, Thurmont
- Health & Medical, Thurmont
- Health And Medical Centers, Thurmont
- Health Clubs & Gymnasiums, Thurmont
- Healthcare Providers, Practitioners & Professionals, Thurmont
- Hearing Aids & Assistive Devices & Supplies, Thurmont - Hearing Devices
- Heating & Air Conditioning Repair, Installation & Service Contractors, Thurmont - HVAC Contractors
- Heating & Air-Conditioning Contractors, Thurmont - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating Contractors, Thurmont - Heating Systems - Installation & Repair
- Heavy Haul Trucking Companies, Thurmont - Heavy Equipment & Machinery Hauling & Transportation
- Highway Surfacing & Paving Contractors, Thurmont - Pavers - Paving Companies
- Hobby & Model Shops & Supplies, Thurmont
- Home Additions & Remodeling Contractors, Thurmont - Refinishing & Restoration
- Home Appliance Repair, Sales & Services, Thurmont
- Home Decor Stores, Thurmont - Home Decorations, Supplies & Accessories
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- Home Security Companies & Services, Thurmont - Home Alarm Systems & Security Systems, Video Surveillance System, Etc
- Horseback Riding Lessons & Instruction, Thurmont - Horse Riding School
- Hospitals, Thurmont
- Hot Dog Restaurants, Thurmont
- Hot Tubs, Saunas, Whirlpools & Spas - Repair, Service & Parts, Thurmont
- Hot Tubs, Saunas, Whirlpools & Spas Supplies, Equipment & Accessories, Thurmont
- Hotel Motel & Resort Reservations, Thurmont
- Hotels & Motels, Thurmont
- House & Apartment Cleaning, Thurmont
- House Cleaning & Maid Service, Thurmont
- Household & Commercial Appliances Stores, Thurmont
- Household Goods & Furniture Storage , Thurmont
- Household Services, Thurmont
- Hunting & Fishing Preserves, Thurmont
- Hunting & Fishing Programs, Thurmont
- Hunting Trapping & Game Propagation, Thurmont
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