- Ice Cream & Frozen Yogurt, Groton
- Imprinting & Embossing Services, Groton
- Indian Restaurants, Groton
- Industrial & Commercial Cleaning Services & Companies, Groton
- Industrial & Commercial Real Estate, Groton
- Industrial & Heavy Equipment Repair & Service, Groton
- Industrial & Heavy Vehicle Dealers, Groton
- Industrial Equipment & Machinery, Groton
- Industrial Goods & Products - Hard Goods - Large, Groton
- Industrial Goods & Products - Hard Goods - Small, Groton
- Industrial Goods & Products - Soft - Large & Small, Groton
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Groton
- Industrial Supply, Parts & Equipment - Miscellaneous, Groton
- Industry, Groton
- Information Bureaus & Services, Groton
- Information Retrieval Services, Groton
- Information Technology Services, Groton - IT Service
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- Insurance Attorneys & Lawyers, Groton
- Insurance Attorneys & Lawyers, Groton
- Insurance Brokers, Groton
- Insurance Carriers, Groton
- Insurance Carriers By Specialty, Groton
- Insurance Farm, Groton
- Insurance General Liability, Groton
- Insurance Lawyers & Attorneys, Groton
- Insurance Motorcycles, Groton
- Insurance Renters, Groton
- Insurance Services, Groton
- Internal Medicine Doctors, Groton - Internists Physicians & Surgeons
- Internet Services, Groton
- Investment Services & Advisors, Groton
- Investments & Mutual Funds, Groton
- Italian Restaurants, Groton
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