- Ice Cream & Frozen Yogurt, Altadena
- Industrial & Commercial Cleaning Services & Companies, Altadena
- Industrial & Commercial Real Estate, Altadena
- Industrial & Heavy Equipment Repair & Service, Altadena
- Industrial Contractors, Altadena
- Industrial Engineers & Designers, Altadena - Architectural Designers
- Industrial Goods & Products - Hard Goods - Small, Altadena
- Industrial Maintenance & Cleaning Contractors, Altadena
- Industry, Altadena
- Information Bureaus & Services, Altadena
- Information Retrieval Services, Altadena
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- Insurance Carriers, Altadena
- Insurance Farm, Altadena
- Insurance General Liability, Altadena
- Insurance Motorcycles, Altadena
- Insurance Renters, Altadena
- Interdenominational Church, Altadena
- Internet Products - Hardware & Software Providers, Altadena
- Internet Providers, Altadena
- Internet Services, Altadena
- Investment Services & Advisors, Altadena
- Italian Restaurants, Altadena
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