- Hair Care Professionals, Southold
- Handicapped Services, Southold
- Hardware Stores, Southold
- Head Start Centers, Southold
- Health & Diet Food Products - Wholesale & Retail, Southold
- Health & Fitness Program Consultants & Trainers, Southold
- Health & Medical, Southold
- Health And Medical Centers, Southold
- Health Care Information & Services, Southold
- Health Clubs & Gymnasiums, Southold
- Healthcare Providers, Practitioners & Professionals, Southold
- Hearing Aids & Assistive Devices & Supplies, Southold - Hearing Devices
- Heating & Air-Conditioning Contractors, Southold - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating & Plumbing Supplies Stores, Southold
- Heating Contractors, Southold - Heating Systems - Installation & Repair
- Highway Surfacing & Paving Contractors, Southold - Pavers - Paving Companies
- Historical Places & Services, Southold
- Hobby & Model Shops & Supplies, Southold
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- Holiday & Seasonal Merchandise Stores & Products, Southold
- Home Additions & Remodeling Contractors, Southold - Refinishing & Restoration
- Home Decor Stores, Southold - Home Decorations, Supplies & Accessories
- Home Furnishings, Southold - Home Decor Stores, Items & Accessories
- Home Health Care, Southold - Agencies & Services
- Home Security Companies & Services, Southold - Home Alarm Systems & Security Systems, Video Surveillance System, Etc
- Homeowners Insurance, Southold
- Homes Mentally Handicapped, Southold
- Horseback Riding Lessons & Instruction, Southold - Horse Riding School
- Hospital Beds, Southold
- Hospital Equipment & Supplies, Southold
- Hospital, Dental & Medical Equipment & Supplies, Southold
- Hospitals, Southold
- Hotels & Motels, Southold
- House & Apartment Cleaning, Southold
- Household & Commercial Appliances Stores, Southold
- Household Goods & Furniture Storage , Southold
- Hunting & Fishing Equipment, Supplies & Services, Southold
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