- Ice Cream & Frozen Yogurt, Brookville
- Ice Wholesale, Brookville - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, Brookville
- Industrial & Commercial Real Estate, Brookville
- Industrial & Heavy Equipment Repair & Service, Brookville
- Industrial Contractors, Brookville
- Industrial Goods & Products - Hard Goods - Large, Brookville
- Industrial Goods & Products - Hard Goods - Small, Brookville
- Industrial Goods & Products - Soft - Large & Small, Brookville
- Industrial Lifts, Brookville
- Industrial Supply, Parts & Equipment - Miscellaneous, Brookville
- Industry, Brookville
- Insurance Brokers, Brookville
- Insurance Carriers, Brookville
- Insurance Carriers By Specialty, Brookville
- Insurance Claim Processing Services, Brookville
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- Insurance Consulting & Information Services, Brookville
- Insurance Farm, Brookville
- Insurance General Liability, Brookville
- Insurance Marine, Brookville
- Insurance Medicare, Brookville
- Insurance Motorcycles, Brookville
- Insurance Renters, Brookville
- Insurance Services, Brookville
- Insurance Travel, Brookville
- Internet Providers, Brookville
- Internet Services, Brookville
- Investment Management Services, Brookville
- Investment Services & Advisors, Brookville
- Iron, Steel & Metal Fabricators, Brookville - Fabrication Companies
- Italian Restaurants, Brookville
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