- Ice Cream & Frozen Yogurt, Fairfield
- Industrial & Commercial Cleaning Services & Companies, Fairfield
- Industrial & Heavy Equipment Repair & Service, Fairfield
- Industrial Contractors, Fairfield
- Industrial Goods & Products - Hard Goods - Large, Fairfield
- Industrial Goods & Products - Hard Goods - Small, Fairfield
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Fairfield
- Industrial Supply, Parts & Equipment - Miscellaneous, Fairfield
- Industrial Waste Disposal, Fairfield
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- Industrial Waste Recycling, Fairfield
- Industry, Fairfield
- Information Retrieval Services, Fairfield
- Insulation Contractors, Fairfield - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Fairfield
- Internet Marketing & Advertising Services, Fairfield
- Internet Services, Fairfield
- Investment Services & Advisors, Fairfield
- Iron, Steel & Metal Fabricators, Fairfield - Fabrication Companies
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