- Ice Cream & Frozen Yogurt, Arlington
- Industrial & Commercial Cleaning Services & Companies, Arlington
- Industrial & Commercial Truck & Vehicle Manufacturers, Arlington
- Industrial Contractors, Arlington
- Industrial Equipment & Machinery, Arlington
- Industrial Goods & Products - Hard Goods - Large, Arlington
- Industrial Goods & Products - Hard Goods - Small, Arlington
- Industrial Goods & Products - Soft - Large & Small, Arlington
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Arlington
- Industry, Arlington
- Information Bureaus & Services, Arlington
- Instrument Manufacturers, Arlington
- Insulation Contractors, Arlington - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Arlington
- Insurance Carriers By Specialty, Arlington
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- Insurance Consulting & Information Services, Arlington
- Insurance Farm, Arlington
- Insurance General Liability, Arlington
- Insurance Motorcycles, Arlington
- Insurance Real Property, Arlington
- Insurance Renters, Arlington
- Insurance Services, Arlington
- Interior Designers, Arlington
- Interior Designers & Decorators, Arlington
- Internet Providers, Arlington
- Internet Services, Arlington
- Investment Services & Advisors, Arlington
- Iron, Steel & Metal Fabricators, Arlington - Fabrication Companies
- Italian Restaurants, Arlington
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