- Ice Cream & Frozen Yogurt, Windsor
- Ice Sports Clubs & Instruction, Windsor
- In Home Services, Windsor
- Industrial & Commercial Cleaning Services & Companies, Windsor
- Industrial Contractors, Windsor
- Industrial Equipment & Machinery, Windsor
- Industrial Equipment & Machinery - Other, Windsor
- Industrial Furnace, Windsor
- Industrial Generators, Windsor
- Industrial Goods & Products - Hard Goods - Large, Windsor
- Industrial Goods & Products - Hard Goods - Small, Windsor
- Industrial Goods & Products - Soft - Large & Small, Windsor
- Industrial Heat & Electrical Supplies & Equipment, Windsor
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Windsor
- Industrial Waste Disposal, Windsor
- Industrial Waste Recycling, Windsor
- Industry, Windsor
- Information Technology Services, Windsor - IT Service
- Inspection & Testing Services, Windsor
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- Insurance Brokers, Windsor
- Insurance Carriers, Windsor
- Insurance Farm, Windsor
- Insurance General Liability, Windsor
- Insurance Major Medical, Windsor
- Insurance Motorcycles, Windsor
- Insurance Renters, Windsor
- Insurance Services, Windsor
- Interior Designers, Windsor
- Interior Designers & Decorators, Windsor
- Internet Marketing & Advertising Services, Windsor
- Internet Providers, Windsor
- Internet Services, Windsor
- Investment Management Services, Windsor
- Investment Services & Advisors, Windsor
- Invitations & Announcements, Windsor - Baby Announcements, Wedding Invitations, Etc
- Irrigation Systems & Equipment, Windsor
- Italian Restaurants, Windsor
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