- Ice Cream & Frozen Yogurt, Jefferson
- Independent Church, Jefferson
- Industrial & Commercial Cleaning Services & Companies, Jefferson
- Industrial & Personal Service Paper, Boxes & Cardboard, Jefferson
- Industrial Contractors, Jefferson
- Industrial Equipment & Machinery, Jefferson
- Industrial Goods & Products - Hard Goods - Large, Jefferson
- Industrial Goods & Products - Hard Goods - Small, Jefferson
- Industrial Goods & Products - Soft - Large & Small, Jefferson
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Jefferson
- Industry, Jefferson
- Inspection & Testing Services, Jefferson
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- Insulation Contractors, Jefferson - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Jefferson
- Insurance Carriers, Jefferson
- Insurance Farm, Jefferson
- Insurance Services, Jefferson
- International Community Of Christ Church, Jefferson
- Internet Providers, Jefferson
- Internet Services, Jefferson
- Investment Management Services, Jefferson
- Investment Services & Advisors, Jefferson
- Iron, Steel & Metal Fabricators, Jefferson - Fabrication Companies
- Italian Restaurants, Jefferson
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