- Industrial & Commercial Cleaning Services & Companies, Northwood
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Northwood
- Industrial & Heavy Vehicle Dealers, Northwood
- Industrial Contractors, Northwood
- Industrial Equipment & Machinery, Northwood
- Industrial Goods & Products - Hard Goods - Large, Northwood
- Industrial Goods & Products - Hard Goods - Small, Northwood
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Northwood
- Industrial Supply, Parts & Equipment - Miscellaneous, Northwood
- Industry, Northwood
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- Insulation & Energy Conservation Materials, Northwood
- Insulation Contractors, Northwood - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Northwood
- Insurance General Liability, Northwood
- Insurance Motorcycles, Northwood
- Insurance Renters, Northwood
- Insurance Services, Northwood
- Investment Services & Advisors, Northwood
- Iron, Steel & Metal Fabricators, Northwood - Fabrication Companies
- Italian Restaurants, Northwood
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