- Ice Cream & Frozen Yogurt, Fullerton
- Image Consultants Personal, Fullerton
- Import Nonclassifiable Services, Fullerton
- Import Services, Fullerton
- Importers, Fullerton
- Imprinting & Embossing Services, Fullerton
- Independent Church, Fullerton
- Indian Restaurants, Fullerton
- Individual & Family Information & Referral Services, Fullerton
- Individual & Family Services, Fullerton
- Industrial & Commercial Cleaning Services & Companies, Fullerton
- Industrial & Commercial Real Estate, Fullerton
- Industrial & Heavy Equipment Repair & Service, Fullerton
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Fullerton
- Industrial & Personal Service Paper, Boxes & Cardboard, Fullerton
- Industrial Contractors, Fullerton
- Industrial Developers, Fullerton
- Industrial Engineers & Designers, Fullerton - Architectural Designers
- Industrial Engines, Fullerton
- Industrial Equipment & Machinery, Fullerton
- Industrial Equipment & Systems, Fullerton
- Industrial Furnace, Fullerton
- Industrial Goods & Products - Hard Goods - Large, Fullerton
- Industrial Goods & Products - Hard Goods - Small, Fullerton
- Industrial Goods & Products - Soft - Large & Small, Fullerton
- Industrial Heat & Electrical Supplies & Equipment, Fullerton
- Industrial Heaters & Boilers, Fullerton
- Industrial Lifts, Fullerton
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Fullerton
- Industrial Manufacturers, Fullerton
- Industrial Plant Construction, Fullerton
- Industrial Pumps, Fullerton - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Fullerton
- Industrial Tools, Fullerton
- Industrial Vehicle Repair, Fullerton
- Industry, Fullerton
- Information Bureaus & Services, Fullerton
- Information Retrieval Services, Fullerton
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- Information Technology Services, Fullerton - IT Service
- Inspecting & Testing Engineer, Fullerton
- Inspection & Testing Services, Fullerton
- Insulation & Energy Conservation Materials, Fullerton
- Insulation Contractors, Fullerton - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Fullerton
- Insurance Brokers, Fullerton
- Insurance Carriers, Fullerton
- Insurance Carriers By Specialty, Fullerton
- Insurance Claim Processing Services, Fullerton
- Insurance Consulting & Information Services, Fullerton
- Insurance Farm, Fullerton
- Insurance General Liability, Fullerton
- Insurance Motorcycles, Fullerton
- Insurance Renters, Fullerton
- Insurance Services, Fullerton
- Interactive & Multimedia Software, Fullerton
- Intercom Systems & Services, Fullerton
- Interdenominational Church, Fullerton
- Interior Designers, Fullerton
- Interior Designers & Decorators, Fullerton
- Interior Designers Professional, Fullerton
- Internal Medicine Doctors, Fullerton - Internists Physicians & Surgeons
- International Community Of Christ Church, Fullerton
- International Marketing, Fullerton
- Internet Entertainment, Fullerton - Internet Services
- Internet Marketing & Advertising Services, Fullerton
- Internet Providers, Fullerton
- Internet Services, Fullerton
- Internet Websites, Fullerton - Web Hosting, etc
- Investment Management Services, Fullerton
- Investment Services & Advisors, Fullerton
- Invitations & Envelopes, Fullerton
- Iron Work Contractors, Fullerton
- Iron, Steel & Metal Fabricators, Fullerton - Fabrication Companies
- Islamic Church, Fullerton
- Italian Restaurants, Fullerton
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