- Ice Cream & Frozen Dessert Storage & Equipment, Seymour
- Ice Cream & Frozen Yogurt, Seymour
- Imprinting & Embossing Services, Seymour
- Individual & Family Information & Referral Services, Seymour
- Individual & Family Services, Seymour
- Industrial & Commercial Cleaning Services & Companies, Seymour
- Industrial & Heavy Vehicle Dealers, Seymour
- Industrial & Personal Service Paper, Boxes & Cardboard, Seymour
- Industrial Contractors, Seymour
- Industrial Developers, Seymour
- Industrial Equipment & Machinery, Seymour
- Industrial Generators, Seymour
- Industrial Goods & Products - Hard Goods - Large, Seymour
- Industrial Goods & Products - Hard Goods - Small, Seymour
- Industrial Goods & Products - Soft - Large & Small, Seymour
- Industrial Heat & Electrical Supplies & Equipment, Seymour
- Industrial Lifts, Seymour
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Seymour
- Industrial Supply, Parts & Equipment - Miscellaneous, Seymour
- Industrial Trucks, Seymour
- Industrial Waterway & Dock Construction, Seymour
- Industry, Seymour
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- Information Bureaus & Services, Seymour
- Insulation & Energy Conservation Materials, Seymour
- Insulation Contractors, Seymour - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Seymour
- Insurance Consulting & Information Services, Seymour
- Insurance Farm, Seymour
- Insurance General Liability, Seymour
- Insurance Major Medical, Seymour
- Insurance Motorcycles, Seymour
- Insurance Renters, Seymour
- Insurance Services, Seymour
- Interior Designers, Seymour
- Interior Designers & Decorators, Seymour
- Internet Marketing & Advertising Services, Seymour
- Internet Providers, Seymour
- Internet Services, Seymour
- Investment Management Services, Seymour
- Investment Services & Advisors, Seymour
- Iron, Steel & Metal Fabricators, Seymour - Fabrication Companies
- Irrigation Systems & Equipment, Seymour
- Italian Restaurants, Seymour
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