- Ice Cream & Frozen Desserts, Frankfort
- Ice Wholesale, Frankfort - Dry Ice
- Independent Church, Frankfort
- Individual & Family Information & Referral Services, Frankfort
- Industrial & Commercial Cleaning Services & Companies, Frankfort
- Industrial & Heavy Vehicle Dealers, Frankfort
- Industrial & Personal Service Paper, Boxes & Cardboard, Frankfort
- Industrial Contractors, Frankfort
- Industrial Equipment & Machinery, Frankfort
- Industrial Goods & Products - Hard Goods - Large, Frankfort
- Industrial Goods & Products - Hard Goods - Small, Frankfort
- Industrial Goods & Products - Soft - Large & Small, Frankfort
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Frankfort
- Industrial Pumps, Frankfort - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Frankfort
- Industrial Trucks, Frankfort
- Industrial Waste Disposal, Frankfort
- Industrial Waste Recycling, Frankfort
- Industry, Frankfort
- Information Bureaus & Services, Frankfort
- Inspection & Testing Services, Frankfort
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- Insulation Contractors, Frankfort - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Frankfort
- Insurance Carriers, Frankfort
- Insurance Consulting & Information Services, Frankfort
- Insurance Crop, Frankfort
- Insurance Farm, Frankfort
- Insurance General Liability, Frankfort
- Insurance Motorcycles, Frankfort
- Insurance Recreational, Frankfort
- Insurance Renters, Frankfort
- Insurance Services, Frankfort
- Insurance Third Party Administrators, Frankfort
- Interior Designers, Frankfort
- Interior Designers & Decorators, Frankfort
- Internal Medicine Doctors, Frankfort - Internists Physicians & Surgeons
- International Trade Consultants, Frankfort - Foreign Trade
- Internet Providers, Frankfort
- Internet Services, Frankfort
- Investment Management Services, Frankfort
- Investment Services & Advisors, Frankfort
- Italian Restaurants, Frankfort
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