- Individual & Family Information & Referral Services, Southold
- Industrial & Commercial Cleaning Services & Companies, Southold
- Industrial & Commercial Real Estate, Southold
- Industrial Goods & Products - Hard Goods - Large, Southold
- Industrial Goods & Products - Hard Goods - Small, Southold
- Industrial Heaters & Boilers, Southold
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Southold
- Industry, Southold
- Information Bureaus & Services, Southold
- Inspection & Testing Services, Southold
- Insurance Carriers, Southold
- Insurance General Liability, Southold
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- Insurance Motorcycles, Southold
- Insurance Renters, Southold
- Interior Designers, Southold
- Interior Designers & Decorators, Southold
- Internet Entertainment, Southold - Internet Services
- Internet Services, Southold
- Internet Websites, Southold - Web Hosting, etc
- Investment Services & Advisors, Southold
- Investments & Mutual Funds, Southold
- Invitations & Announcements, Southold - Baby Announcements, Wedding Invitations, Etc
- Irrigation Systems & Equipment, Southold
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