- Ice Cream & Frozen Yogurt, Bridgehampton
- Industrial & Commercial Cleaning Services & Companies, Bridgehampton
- Industrial & Commercial Real Estate, Bridgehampton
- Industrial Contractors, Bridgehampton
- Industrial Engineers & Designers, Bridgehampton - Architectural Designers
- Industrial Goods & Products - Soft - Large & Small, Bridgehampton
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Bridgehampton
- Industry, Bridgehampton
- Inks, Bridgehampton
- Inks - Manufacturing, Bridgehampton
- Inspection & Testing Services, Bridgehampton
- Insurance Brokers, Bridgehampton
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- Insurance Carriers, Bridgehampton
- Insurance Farm, Bridgehampton
- Insurance Motorcycles, Bridgehampton
- Insurance Renters, Bridgehampton
- Insurance Services, Bridgehampton
- Interior Designers, Bridgehampton
- Interior Designers & Decorators, Bridgehampton
- Internet Services, Bridgehampton
- Investment Services & Advisors, Bridgehampton
- Iron, Steel & Metal Fabricators, Bridgehampton - Fabrication Companies
- Irrigation Systems & Equipment, Bridgehampton
- Italian Restaurants, Bridgehampton
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