- Ice Cream & Frozen Yogurt, Brookfield
- Individual & Family Information & Referral Services, Brookfield
- Indoor Sports Equipment Manufacturers, Brookfield
- Industrial & Commercial Cleaning Services & Companies, Brookfield
- Industrial & Commercial Real Estate, Brookfield
- Industrial & Heavy Equipment Repair & Service, Brookfield
- Industrial & Personal Service Paper, Boxes & Cardboard, Brookfield
- Industrial Contractors, Brookfield
- Industrial Equipment & Machinery, Brookfield
- Industrial Equipment & Systems, Brookfield
- Industrial Generators, Brookfield
- Industrial Goods & Products - Hard Goods - Large, Brookfield
- Industrial Goods & Products - Hard Goods - Small, Brookfield
- Industrial Goods & Products - Soft - Large & Small, Brookfield
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Brookfield
- Industrial Maintenance & Cleaning Contractors, Brookfield
- Industrial Pump Repair & Service, Brookfield - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Brookfield - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Brookfield
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- Industry, Brookfield
- Inspection & Testing Services, Brookfield
- Insulation Contractors, Brookfield - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Brookfield
- Insurance General Liability, Brookfield
- Insurance Motorcycles, Brookfield
- Insurance Renters, Brookfield
- Interior Designers, Brookfield
- Interior Designers & Decorators, Brookfield
- Interior Designers Professional, Brookfield
- Internal Medicine Doctors, Brookfield - Internists Physicians & Surgeons
- Internet Services, Brookfield
- Inventory Management Services, Brookfield - Inventory Service
- Inventory Service Commercial, Brookfield
- Investment Management Services, Brookfield
- Investment Services & Advisors, Brookfield
- Iron, Steel & Metal Fabricators, Brookfield - Fabrication Companies
- Italian Restaurants, Brookfield
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