- Hardware Stores, Miller Place
- Head Start Centers, Miller Place
- Health & Diet Food Products - Wholesale & Retail, Miller Place
- Health & Medical, Miller Place
- Health And Medical Centers, Miller Place
- Health Care Information & Services, Miller Place
- Health Clubs & Gymnasiums, Miller Place
- Healthcare Providers, Practitioners & Professionals, Miller Place
- Heating & Air-Conditioning Contractors, Miller Place - HVAC Contractors - Installation, Repair, Replace Service, etc
- Heating Contractors, Miller Place - Heating Systems - Installation & Repair
- Historical Organizations, Miller Place
- Historical Societies, Miller Place
- Hockey Equipment & Supplies, Miller Place
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- Home Additions & Remodeling Contractors, Miller Place - Refinishing & Restoration
- Home Decor Accessories & Supplies, Miller Place - Wholesale & Suppliers
- Home Decor Stores, Miller Place - Home Decorations, Supplies & Accessories
- Home Electronics, Miller Place
- Home Security Companies & Services, Miller Place - Home Alarm Systems & Security Systems, Video Surveillance System, Etc
- Home Theaters, Miller Place
- Homeowners Insurance, Miller Place
- Hospital, Dental & Medical Equipment & Supplies, Miller Place
- Hospitals, Miller Place
- Hot Tubs, Saunas, Whirlpools & Spas Supplies, Equipment & Accessories, Miller Place
- Hotels & Motels, Miller Place
- Household & Commercial Appliances Stores, Miller Place
- Household Goods & Furniture Storage , Miller Place
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