- Hair Care Professionals, New Canaan
- Hardware Stores, New Canaan
- Harness, Saddles & Supplies, New Canaan
- Hauling And Shipping, New Canaan
- Health & Diet Food Products - Wholesale & Retail, New Canaan
- Health & Fitness Program Consultants & Trainers, New Canaan
- Health & Medical, New Canaan
- Health And Medical Centers, New Canaan
- Health Care Information & Services, New Canaan
- Health Clubs & Gymnasiums, New Canaan
- Healthcare Consultants, New Canaan
- Healthcare Providers, Practitioners & Professionals, New Canaan
- Heating & Air-Conditioning Contractors, New Canaan - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating & Plumbing Supplies Stores, New Canaan
- Holding Companies, New Canaan
- Home Additions & Remodeling Contractors, New Canaan - Refinishing & Restoration
- Home Decor Stores, New Canaan - Home Decorations, Supplies & Accessories
- Home Furnishings, New Canaan - Home Decor Stores, Items & Accessories
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- Home Health Care, New Canaan - Agencies & Services
- Home Improvement Centers, New Canaan
- Home Security Companies & Services, New Canaan - Home Alarm Systems & Security Systems, Video Surveillance System, Etc
- Homeowners Insurance, New Canaan
- Horseback Riding Lessons & Instruction, New Canaan - Horse Riding School
- Hosiery Manufacturers, New Canaan
- Hosiery Wholesale & Retail, New Canaan
- Hospital, Dental & Medical Equipment & Supplies, New Canaan
- Hospitals, New Canaan
- Hotels & Motels, New Canaan
- House & Apartment Cleaning, New Canaan
- Household & Commercial Appliances Stores, New Canaan
- Household Goods & Furniture Storage , New Canaan
- Household Products, New Canaan
- Housing Authority, New Canaan
- Hunan Restaurants, New Canaan
- Hunting Trapping & Game Propagation, New Canaan
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