- Ice Cream & Frozen Dessert Storage & Equipment, Hawthorne
- Immigration & Naturalization Services, Hawthorne
- Importers, Hawthorne
- Independent Church, Hawthorne
- Indian Goods & Products Stores, Hawthorne
- Industrial & Commercial Cleaning Services & Companies, Hawthorne
- Industrial & Commercial Real Estate, Hawthorne
- Industrial & Heavy Equipment Repair & Service, Hawthorne
- Industrial Contractors, Hawthorne
- Industrial Developers, Hawthorne
- Industrial Equipment & Machinery, Hawthorne
- Industrial Goods & Products - Hard Goods - Large, Hawthorne
- Industrial Goods & Products - Hard Goods - Small, Hawthorne
- Industrial Goods & Products - Soft - Large & Small, Hawthorne
- Industrial Heaters & Boilers, Hawthorne
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Hawthorne
- Industrial Supply, Parts & Equipment - Miscellaneous, Hawthorne
- Industrial Vehicle Repair, Hawthorne
- Industry, Hawthorne
- Information Bureaus & Services, Hawthorne
- Information Retrieval Services, Hawthorne
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- Information Technology Services, Hawthorne - IT Service
- Inspection & Testing Services, Hawthorne
- Insurance Carriers, Hawthorne
- Insurance Farm, Hawthorne
- Insurance General Liability, Hawthorne
- Insurance Motorcycles, Hawthorne
- Insurance Renters, Hawthorne
- Insurance Services, Hawthorne
- Interactive & Multimedia Software, Hawthorne
- Intercom Systems & Services, Hawthorne
- Interior Designers & Decorators, Hawthorne
- International Affairs, Hawthorne
- International Trade Consultants, Hawthorne - Foreign Trade
- Internet Marketing & Advertising Services, Hawthorne
- Internet Providers, Hawthorne
- Internet Services, Hawthorne
- Investment Management Services, Hawthorne
- Investment Services & Advisors, Hawthorne
- Irrigation Systems & Equipment, Hawthorne
- Islamic Church, Hawthorne
- Italian Restaurants, Hawthorne
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