- Ice Cream & Frozen Yogurt, Brookfield
- Industrial & Commercial Cleaning Services & Companies, Brookfield
- Industrial & Commercial Real Estate, Brookfield
- Industrial Contractors, Brookfield
- Industrial Equipment & Machinery, Brookfield
- Industrial Goods & Products - Hard Goods - Large, Brookfield
- Industrial Goods & Products - Hard Goods - Small, Brookfield
- Industrial Supply, Parts & Equipment - Miscellaneous, Brookfield
- Industrial Vehicle Repair, Brookfield
- Industry, Brookfield
- Information Bureaus & Services, Brookfield
- Information Technology Services, Brookfield - IT Service
- Insurance Carriers, Brookfield
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- Insurance Consulting & Information Services, Brookfield
- Insurance Farm, Brookfield
- Insurance General Liability, Brookfield
- Insurance Motorcycles, Brookfield
- Insurance Renters, Brookfield
- Insurance Services, Brookfield
- Internet Services, Brookfield
- Investment Management Services, Brookfield
- Investment Services & Advisors, Brookfield
- Invitations & Envelopes, Brookfield
- Irish Restaurants, Brookfield
- Iron, Steel & Metal Fabricators, Brookfield - Fabrication Companies
- Italian Restaurants, Brookfield
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