- Ice Cream & Frozen Yogurt, Helena
- Industrial & Heavy Vehicle Dealers, Helena
- Industrial & Personal Service Paper, Boxes & Cardboard, Helena
- Industrial Contractors, Helena
- Industrial Equipment & Machinery, Helena
- Industrial Goods & Products - Hard Goods - Large, Helena
- Industrial Goods & Products - Hard Goods - Small, Helena
- Industrial Goods & Products - Soft - Large & Small, Helena
- Industrial Trucks, Helena
- Industry, Helena
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- Insurance Carriers, Helena
- Insurance Farm, Helena
- Insurance General Liability, Helena
- Insurance Motorcycles, Helena
- Insurance Renters, Helena
- Interior Designers, Helena
- Interior Designers & Decorators, Helena
- Internet Services, Helena
- Iron, Steel & Metal Fabricators, Helena - Fabrication Companies
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