- Ice Cream & Frozen Yogurt, Arlington
- Indian Goods & Products Stores, Arlington
- Indian Restaurants, Arlington
- Individual & Family Information & Referral Services, Arlington
- Industrial & Commercial Cleaning Services & Companies, Arlington
- Industrial & Commercial Real Estate, Arlington
- Industrial Contractors, Arlington
- Industrial Equipment & Machinery, Arlington
- Industrial Goods & Products - Hard Goods - Small, Arlington
- Industrial Goods & Products - Soft - Large & Small, Arlington
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Arlington
- Industrial Maintenance & Cleaning Contractors, Arlington
- Industrial Supply, Parts & Equipment - Miscellaneous, Arlington
- Industry, Arlington
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- Information Bureaus & Services, Arlington
- Inspection & Testing Services, Arlington
- Insurance Brokers, Arlington
- Insurance Carriers, Arlington
- Insurance Services, Arlington
- Interior Designers & Decorators, Arlington
- Internal Medicine Doctors, Arlington - Internists Physicians & Surgeons
- International Trade Consultants, Arlington - Foreign Trade
- Internet Providers, Arlington
- Internet Services, Arlington
- Investment Management Services, Arlington
- Investment Services & Advisors, Arlington
- Irrigation Systems & Equipment, Arlington
- Italian Restaurants, Arlington
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