- Hair Care Professionals, Houlton
- Hamburger Restaurants, Houlton
- Hardware Stores, Houlton
- Health & Medical, Houlton
- Health And Medical Centers, Houlton
- Health Care Information & Services, Houlton
- Health Charitable & Non-Profit Organizations, Houlton
- Health Clubs & Gymnasiums, Houlton
- Health Maintenance Organizations, Houlton
- Healthcare Providers, Practitioners & Professionals, Houlton
- Heating & Air-Conditioning Contractors, Houlton - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating & Plumbing Supplies Stores, Houlton
- Heating Contractors, Houlton - Heating Systems - Installation & Repair
- Highway Surfacing & Paving Contractors, Houlton - Pavers - Paving Companies
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- Home & Consumer Electronics & Appliances Rental, Houlton
- Home Health Care, Houlton - Agencies & Services
- Homeowners Insurance, Houlton
- Hospices, Houlton - Hospice Services
- Hospital, Dental & Medical Equipment & Supplies, Houlton
- Hospitals, Houlton
- Hot Dog Restaurants, Houlton
- Hotels & Motels, Houlton
- House & Apartment Cleaning, Houlton
- Household & Commercial Appliances Stores, Houlton
- Household Goods & Furniture Storage , Houlton
- Housing Authority, Houlton
- Human Resource Management & Consultants, Houlton
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