- Hair Care Professionals, Norwalk
- Hamburger Restaurants, Norwalk
- Hardware Stores, Norwalk
- Hazardous Material Detection Services, Norwalk - Leak Detection
- Health & Diet Food Products - Wholesale & Retail, Norwalk
- Health & Medical, Norwalk
- Health & Safety Industrial, Norwalk
- Health And Medical Centers, Norwalk
- Health Associations, Norwalk
- Health Charitable & Non-Profit Organizations, Norwalk
- Health Clubs & Gymnasiums, Norwalk
- Health Insurance, Norwalk
- Healthcare Providers, Practitioners & Professionals, Norwalk
- Hearing Aids & Assistive Devices & Supplies, Norwalk - Hearing Devices
- Heating & Air Conditioning Equipment, Parts & Supplies, Norwalk - HVAC Suppliers & Companies
- Heating & Air Conditioning Repair, Installation & Service Contractors, Norwalk - HVAC Contractors
- Heating & Air-Conditioning Contractors, Norwalk - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating & Plumbing Supplies Stores, Norwalk
- Heating Contractors, Norwalk - Heating Systems - Installation & Repair
- Heating Equipment & Systems - Cleaning & Repair, Norwalk - Heat Pump, Incinerator, Heat Exchanger, Heaters, Etc
- Highway & Street Construction Contractors, Norwalk - Road Construction
- Highway Surfacing & Paving Contractors, Norwalk - Pavers - Paving Companies
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- Home & Consumer Electronics & Appliances Rental, Norwalk
- Home Additions & Remodeling Contractors, Norwalk - Refinishing & Restoration
- Home Decor Stores, Norwalk - Home Decorations, Supplies & Accessories
- Home Furnishings, Norwalk - Home Decor Stores, Items & Accessories
- Home Health Care, Norwalk - Agencies & Services
- Homeowners Insurance, Norwalk
- Hospices, Norwalk - Hospice Services
- Hospital & Medical Insurance Plans, Norwalk
- Hospital, Dental & Medical Equipment & Supplies, Norwalk
- Hospitals, Norwalk
- Hot Dog Restaurants, Norwalk
- Hot Tubs, Saunas, Whirlpools & Spas Supplies, Equipment & Accessories, Norwalk
- Hot Water Heater Installation & Repair, Norwalk - Gas & Electric Water Heater Services
- Hotels & Motels, Norwalk
- House & Apartment Cleaning, Norwalk
- House & Building Washing & Maintenance Exterior, Norwalk
- Household & Commercial Appliances Stores, Norwalk
- Household Goods & Furniture Storage , Norwalk
- Housing Authority, Norwalk
- Humane Societies, Norwalk
- Hydraulic Equipment Repair & Service, Norwalk
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