- Ice Cream & Frozen Yogurt, Oakland
- Industrial & Commercial Cleaning Services & Companies, Oakland
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Oakland
- Industrial Goods & Products - Hard Goods - Large, Oakland
- Industrial Goods & Products - Hard Goods - Small, Oakland
- Industrial Goods & Products - Soft - Large & Small, Oakland
- Industrial Machinery Manufacturers, Oakland
- Industrial Supply, Parts & Equipment - Miscellaneous, Oakland
- Industry, Oakland
- Information Retrieval Services, Oakland
- Inspection & Testing Services, Oakland
- Insulation & Energy Conservation Materials, Oakland
- Insulation Contractors, Oakland - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
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- Insurance Carriers, Oakland
- Insurance Consulting & Information Services, Oakland
- Insurance General Liability, Oakland
- Insurance Motorcycles, Oakland
- Insurance Renters, Oakland
- Insurance Services, Oakland
- Interior Designers & Decorators, Oakland
- Internet Providers, Oakland
- Internet Services, Oakland
- Investment Services & Advisors, Oakland
- Irrigation Systems & Equipment, Oakland
- Italian Restaurants, Oakland
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