- Ice Cream & Frozen Yogurt, Alpena
- Ignition Apparatus Manufacturers, Alpena
- Imported Auto Parts, Alpena
- Imprinting & Embossing Services, Alpena
- Individual & Family Information & Referral Services, Alpena
- Industrial & Commercial Cleaning Services & Companies, Alpena
- Industrial & Commercial Real Estate, Alpena
- Industrial & Heavy Equipment Repair & Service, Alpena
- Industrial & Heavy Vehicle Dealers, Alpena
- Industrial & Personal Service Paper, Boxes & Cardboard, Alpena
- Industrial Contractors, Alpena
- Industrial Equipment & Machinery, Alpena
- Industrial Filters, Alpena
- Industrial Goods & Products - Hard Goods - Large, Alpena
- Industrial Goods & Products - Hard Goods - Small, Alpena
- Industrial Goods & Products - Soft - Large & Small, Alpena
- Industrial Machinery Manufacturers, Alpena
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Alpena
- Industrial Supply, Parts & Equipment - Miscellaneous, Alpena
- Industrial Trucks, Alpena
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- Industrial Vehicle Repair, Alpena
- Industry, Alpena
- Information Bureaus & Services, Alpena
- Inspection & Testing Services, Alpena
- Insulation & Energy Conservation Materials, Alpena
- Insulation Contractors, Alpena - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Alpena
- Insurance Carriers, Alpena
- Insurance Carriers By Specialty, Alpena
- Insurance Farm, Alpena
- Insurance General Liability, Alpena
- Insurance Motorcycles, Alpena
- Insurance Real Property, Alpena
- Insurance Renters, Alpena
- Insurance Services, Alpena
- Internet Services, Alpena
- Investment Management Services, Alpena
- Investment Services & Advisors, Alpena
- Irrigation Ditch Contractors, Alpena
- Italian Restaurants, Alpena
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