- Ice Cream & Frozen Yogurt, Seaford
- Ice Wholesale, Seaford - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, Seaford
- Industrial & Commercial Real Estate, Seaford
- Industrial & Commercial Real Estate Companies, Seaford
- Industrial & Heavy Equipment Repair & Service, Seaford
- Industrial Contractors, Seaford
- Industrial Equipment & Machinery, Seaford
- Industrial Goods & Products - Hard Goods - Large, Seaford
- Industrial Goods & Products - Hard Goods - Small, Seaford
- Industrial Goods & Products - Soft - Large & Small, Seaford
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Seaford
- Industrial Vehicle Repair, Seaford
- Industry, Seaford
- Insulation Contractors, Seaford - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
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- Insurance Carriers, Seaford
- Insurance Carriers By Specialty, Seaford
- Insurance Consulting & Information Services, Seaford
- Insurance Farm, Seaford
- Insurance General Liability, Seaford
- Insurance Motorcycles, Seaford
- Insurance Renters, Seaford
- Insurance Services, Seaford
- Internal Medicine Doctors, Seaford - Internists Physicians & Surgeons
- Internet Services, Seaford
- Investment Management Services, Seaford
- Investment Services & Advisors, Seaford
- Iron, Steel & Metal Fabricators, Seaford - Fabrication Companies
- Italian Restaurants, Seaford
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