- Ice Cream & Frozen Yogurt, Placentia
- Imported Auto Parts, Placentia
- Importers, Placentia
- In Home Services, Placentia
- Industrial & Commercial Cleaning Services & Companies, Placentia
- Industrial & Commercial Real Estate, Placentia
- Industrial & Heavy Equipment Repair & Service, Placentia
- Industrial & Personal Service Paper, Boxes & Cardboard, Placentia
- Industrial Contractors, Placentia
- Industrial Equipment & Machinery, Placentia
- Industrial Equipment & Systems, Placentia
- Industrial Goods & Products - Hard Goods - Large, Placentia
- Industrial Goods & Products - Hard Goods - Small, Placentia
- Industrial Goods & Products - Soft - Large & Small, Placentia
- Industrial Heat & Electrical Supplies & Equipment, Placentia
- Industrial Machinery Manufacturers, Placentia
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Placentia
- Industrial Supply, Parts & Equipment - Miscellaneous, Placentia
- Industry, Placentia
- Infectious Disease Specialists, Placentia - Doctors, Physicians & Surgeons
- Information Bureaus, Placentia
- Information Bureaus & Services, Placentia
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- Information Technology Services, Placentia - IT Service
- Insurance Adjusters, Placentia
- Insurance Brokers, Placentia
- Insurance Carriers, Placentia
- Insurance Claim Processing Services, Placentia
- Insurance Farm, Placentia
- Insurance General Liability, Placentia
- Insurance Motorcycles, Placentia
- Insurance Renters, Placentia
- Insurance Services, Placentia
- Insurance Underwriters, Placentia
- Interior Designers, Placentia
- Interior Designers & Decorators, Placentia
- Internal Medicine Doctors, Placentia - Internists Physicians & Surgeons
- International Trade Consultants, Placentia - Foreign Trade
- Internet Providers, Placentia
- Internet Services, Placentia
- Investment Management Services, Placentia
- Investment Services & Advisors, Placentia
- Iron, Steel & Metal Fabricators, Placentia - Fabrication Companies
- Italian Restaurants, Placentia
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