- Ice Cream & Frozen Yogurt, Brea
- Ice Sports Clubs & Instruction, Brea
- Imported Auto Parts, Brea
- Importers, Brea
- Imprinting & Embossing Services, Brea
- Indian Restaurants, Brea
- Individual & Family Information & Referral Services, Brea
- Industrial & Commercial Cleaning Services & Companies, Brea
- Industrial & Commercial Real Estate, Brea
- Industrial & Heavy Equipment Repair & Service, Brea
- Industrial & Heavy Vehicle Dealers, Brea
- Industrial & Personal Service Paper, Boxes & Cardboard, Brea
- Industrial Contractors, Brea
- Industrial Developers, Brea
- Industrial Equipment & Machinery, Brea
- Industrial Equipment & Machinery - Other, Brea
- Industrial Equipment & Systems, Brea
- Industrial Filters, Brea
- Industrial Goods & Products - Hard Goods - Large, Brea
- Industrial Goods & Products - Hard Goods - Small, Brea
- Industrial Goods & Products - Soft - Large & Small, Brea
- Industrial Lifts, Brea
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Brea
- Industrial Maintenance & Cleaning Contractors, Brea
- Industrial Supply, Parts & Equipment - Miscellaneous, Brea
- Industry, Brea
- Information & Records Management Services, Brea
- Information Bureaus & Services, Brea
- Information Retrieval Services, Brea
- Information Technology Services, Brea - IT Service
- Inspecting & Testing Engineer, Brea
- Inspection & Testing Services, Brea
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- Instruments, Brea - Control Equipment
- Insulation & Energy Conservation Materials, Brea
- Insulation Contractors, Brea - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Brea
- Insurance Brokers, Brea
- Insurance Carriers, Brea
- Insurance Carriers By Specialty, Brea
- Insurance Claim Processing Services, Brea
- Insurance Farm, Brea
- Insurance General Liability, Brea
- Insurance Motorcycles, Brea
- Insurance Pet, Brea
- Insurance Plan Administrators, Brea
- Insurance Renters, Brea
- Insurance Services, Brea
- Interdenominational Church, Brea
- Interior Designers, Brea
- Interior Designers & Decorators, Brea
- Internal Medicine Doctors, Brea - Internists Physicians & Surgeons
- International Marketing, Brea
- International Trade Consultants, Brea - Foreign Trade
- Internet Marketing & Advertising Services, Brea
- Internet Providers, Brea
- Internet Services, Brea
- Investment Bankers, Brea
- Investment Management Services, Brea
- Investment Services & Advisors, Brea
- Investments & Mutual Funds, Brea
- Iron, Steel & Metal Fabricators, Brea - Fabrication Companies
- Italian Foods, Brea
- Italian Restaurants, Brea
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