- Ice Cream & Frozen Desserts, Merrillville
- Ice Cream & Frozen Yogurt, Merrillville
- Indian Restaurants, Merrillville
- Industrial & Commercial Cleaning Services & Companies, Merrillville
- Industrial & Commercial Real Estate, Merrillville
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Merrillville
- Industrial & Heavy Vehicle Dealers, Merrillville
- Industrial Contractors, Merrillville
- Industrial Equipment & Machinery, Merrillville
- Industrial Goods & Products - Hard Goods - Large, Merrillville
- Industrial Goods & Products - Hard Goods - Small, Merrillville
- Industrial Goods & Products - Soft - Large & Small, Merrillville
- Industrial Lifts, Merrillville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Merrillville
- Industrial Pumps, Merrillville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Merrillville
- Industrial Survey, Merrillville
- Industry, Merrillville
- Information Bureaus & Services, Merrillville
- Information Technology Services, Merrillville - IT Service
- Inspection & Testing Services, Merrillville
- Instrumentation Indicating & Control Consultants, Merrillville
- Insulation Contractors, Merrillville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Merrillville
- Insurance Brokers, Merrillville
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- Insurance Carriers, Merrillville
- Insurance Carriers By Specialty, Merrillville
- Insurance Claim Processing Services, Merrillville
- Insurance Farm, Merrillville
- Insurance General Liability, Merrillville
- Insurance Major Medical, Merrillville
- Insurance Medicare, Merrillville
- Insurance Motorcycles, Merrillville
- Insurance Real Property, Merrillville
- Insurance Renters, Merrillville
- Insurance Services, Merrillville
- Insurance Travel, Merrillville
- Interior Designers, Merrillville
- Interior Designers & Decorators, Merrillville
- Internal Medicine Doctors, Merrillville - Internists Physicians & Surgeons
- Internet Providers, Merrillville
- Internet Services, Merrillville
- Inventory Management Services, Merrillville - Inventory Service
- Investment Bankers, Merrillville
- Investment Management Services, Merrillville
- Investment Services & Advisors, Merrillville
- Irish Restaurants, Merrillville
- Iron & Steel Forging, Merrillville
- Italian Foods, Merrillville
- Italian Restaurants, Merrillville
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