- Ice Cream & Frozen Yogurt, Louisville
- Identification Equipment, Louisville
- Image Consultants Personal, Louisville
- Indian Restaurants, Louisville
- Individual Retirement Accounts (I R A), Louisville
- Industrial & Commercial Cleaning Services & Companies, Louisville
- Industrial & Commercial Real Estate, Louisville
- Industrial & Personal Service Paper, Boxes & Cardboard, Louisville
- Industrial Contractors, Louisville
- Industrial Engineers & Designers, Louisville - Architectural Designers
- Industrial Equipment & Machinery, Louisville
- Industrial Goods & Products - Hard Goods - Large, Louisville
- Industrial Goods & Products - Hard Goods - Small, Louisville
- Industrial Goods & Products - Soft - Large & Small, Louisville
- Industrial Lifts, Louisville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Louisville
- Industrial Piping Process, Louisville
- Industrial Pumps, Louisville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industry, Louisville
- Information Bureaus & Services, Louisville
- Information Processing & Retrieval Systems, Louisville
- Information Retrieval Services, Louisville
- Inspection & Testing Services, Louisville
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- Insurance Brokers, Louisville
- Insurance Carriers, Louisville
- Insurance Carriers By Specialty, Louisville
- Insurance Claim Processing Services, Louisville
- Insurance Consulting & Information Services, Louisville
- Insurance Farm, Louisville
- Insurance General Liability, Louisville
- Insurance Motorcycles, Louisville
- Insurance Real Property, Louisville
- Insurance Renters, Louisville
- Insurance Services, Louisville
- Interior Designers, Louisville
- Interior Designers & Decorators, Louisville
- Interior Designers Professional, Louisville
- Internal Medicine Doctors, Louisville - Internists Physicians & Surgeons
- International Trade Consultants, Louisville - Foreign Trade
- Internet Marketing & Advertising Services, Louisville
- Internet Providers, Louisville
- Internet Services, Louisville
- Investment Management Services, Louisville
- Investment Services & Advisors, Louisville
- Italian Restaurants, Louisville
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