- Ice Cream & Frozen Yogurt, Fairfield
- Imported Auto Parts, Fairfield
- Individual & Family Services, Fairfield
- Industrial & Commercial Cleaning Services & Companies, Fairfield
- Industrial & Heavy Equipment Repair & Service, Fairfield
- Industrial & Personal Service Paper, Boxes & Cardboard, Fairfield
- Industrial Contractors, Fairfield
- Industrial Equipment & Machinery, Fairfield
- Industrial Equipment & Systems, Fairfield
- Industrial Goods & Products - Hard Goods - Large, Fairfield
- Industrial Goods & Products - Hard Goods - Small, Fairfield
- Industrial Goods & Products - Soft - Large & Small, Fairfield
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Fairfield
- Industrial Piping Process, Fairfield
- Industrial Supply, Parts & Equipment - Miscellaneous, Fairfield
- Industrial Waste Disposal, Fairfield
- Industrial Waste Recycling, Fairfield
- Industry, Fairfield
- Inks, Fairfield
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- Inks - Manufacturing, Fairfield
- Inspection & Testing Services, Fairfield
- Insulation Contractors, Fairfield - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Fairfield
- Insurance Claim Processing Services, Fairfield
- Insurance Consulting & Information Services, Fairfield
- Insurance Farm, Fairfield
- Insurance General Liability, Fairfield
- Insurance Motorcycles, Fairfield
- Insurance Renters, Fairfield
- Insurance Services, Fairfield
- Internal Medicine Doctors, Fairfield - Internists Physicians & Surgeons
- Internet Providers, Fairfield
- Internet Services, Fairfield
- Investment Management Services, Fairfield
- Investment Services & Advisors, Fairfield
- Iron, Steel & Metal Fabricators, Fairfield - Fabrication Companies
- Italian Restaurants, Fairfield
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