- Ice Cream & Frozen Yogurt, Forest City
- Ignition Apparatus Manufacturers, Forest City
- Independent Church, Forest City
- Industrial & Commercial Cleaning Services & Companies, Forest City
- Industrial & Commercial Real Estate, Forest City
- Industrial & Personal Service Paper, Boxes & Cardboard, Forest City
- Industrial Contractors, Forest City
- Industrial Equipment & Machinery, Forest City
- Industrial Goods & Products - Hard Goods - Large, Forest City
- Industrial Goods & Products - Hard Goods - Small, Forest City
- Industrial Goods & Products - Soft - Large & Small, Forest City
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Forest City
- Industrial Supply, Parts & Equipment - Miscellaneous, Forest City
- Industrial Tanks, Forest City
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- Industry, Forest City
- Information Bureaus & Services, Forest City
- Inks - Manufacturing, Forest City
- Insurance Annuities, Forest City
- Insurance Benefits Administration, Forest City
- Insurance Carriers, Forest City
- Insurance Carriers By Specialty, Forest City
- Insurance Employee Benefits, Forest City
- Insurance Farm, Forest City
- Interior Designers, Forest City
- Interior Designers & Decorators, Forest City
- Internal Medicine Doctors, Forest City - Internists Physicians & Surgeons
- Investment Management Services, Forest City
- Iron, Steel & Metal Fabricators, Forest City - Fabrication Companies
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