- Ice Cream & Frozen Yogurt, Galena
- Industrial & Commercial Cleaning Services & Companies, Galena
- Industrial Contractors, Galena
- Industrial Equipment & Machinery, Galena
- Industrial Goods & Products - Hard Goods - Large, Galena
- Industrial Goods & Products - Hard Goods - Small, Galena
- Industry, Galena
- Information Bureaus & Services, Galena
- Inspection & Testing Services, Galena
- Insurance Carriers, Galena
- Insurance Carriers By Specialty, Galena
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- Insurance Farm, Galena
- Insurance Real Property, Galena
- Interior Designers, Galena
- Interior Designers & Decorators, Galena
- Internet Marketing & Advertising Services, Galena
- Internet Services, Galena
- Investment Management Services, Galena
- Investment Services & Advisors, Galena
- Irish Restaurants, Galena
- Iron, Steel & Metal Fabricators, Galena - Fabrication Companies
- Italian Restaurants, Galena
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