- Industrial & Commercial Cleaning Services & Companies, Saginaw
- Industrial & Personal Service Paper, Boxes & Cardboard, Saginaw
- Industrial Contractors, Saginaw
- Industrial Equipment & Machinery, Saginaw
- Industrial Goods & Products - Hard Goods - Large, Saginaw
- Industrial Goods & Products - Hard Goods - Small, Saginaw
- Industrial Goods & Products - Soft - Large & Small, Saginaw
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Saginaw
- Industrial Tanks, Saginaw
- Industry, Saginaw
- Inspection & Testing Services, Saginaw
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- Insurance Bond & Finance, Saginaw
- Insurance Carriers, Saginaw
- Insurance Farm, Saginaw
- Insurance General Liability, Saginaw
- Insurance Motorcycles, Saginaw
- Insurance Renters, Saginaw
- Internet Services, Saginaw
- Investment Services & Advisors, Saginaw
- Iron, Steel & Metal Fabricators, Saginaw - Fabrication Companies
- Italian Restaurants, Saginaw
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