- Ice Cream & Frozen Yogurt, Campbellsville
- Individual & Family Information & Referral Services, Campbellsville
- Industrial & Commercial Cleaning Services & Companies, Campbellsville
- Industrial & Commercial Real Estate, Campbellsville
- Industrial Contractors, Campbellsville
- Industrial Equipment & Machinery, Campbellsville
- Industrial Goods & Products - Hard Goods - Large, Campbellsville
- Industrial Goods & Products - Hard Goods - Small, Campbellsville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Campbellsville
- Industrial Supply, Parts & Equipment - Miscellaneous, Campbellsville
- Industry, Campbellsville
- Information Bureaus & Services, Campbellsville
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- Information Retrieval Services, Campbellsville
- Information Technology Services, Campbellsville - IT Service
- Inspection & Testing Services, Campbellsville
- Insurance Carriers, Campbellsville
- Insurance Claim Processing Services, Campbellsville
- Insurance Farm, Campbellsville
- Insurance Services, Campbellsville
- Internal Medicine Doctors, Campbellsville - Internists Physicians & Surgeons
- Internet Services, Campbellsville
- Investment Management Services, Campbellsville
- Investment Services & Advisors, Campbellsville
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