- Ice Cream & Frozen Yogurt, Sylmar
- Ice Manufacturers, Sylmar
- Ice Wholesale, Sylmar - Dry Ice
- Immigration & Naturalization Consultants, Sylmar
- In Home Services, Sylmar
- Industrial & Commercial Cleaning Services & Companies, Sylmar
- Industrial & Commercial Real Estate, Sylmar
- Industrial & Farm Equipment, Sylmar
- Industrial & Heavy Equipment Repair & Service, Sylmar
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Sylmar
- Industrial Contractors, Sylmar
- Industrial Equipment & Machinery, Sylmar
- Industrial Equipment & Machinery - Other, Sylmar
- Industrial Equipment & Systems, Sylmar
- Industrial Generators, Sylmar
- Industrial Goods & Products - Hard Goods - Large, Sylmar
- Industrial Goods & Products - Hard Goods - Small, Sylmar
- Industrial Goods & Products - Soft - Large & Small, Sylmar
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Sylmar
- Industrial Maintenance & Cleaning Contractors, Sylmar
- Industrial Supply, Parts & Equipment - Miscellaneous, Sylmar
- Industry, Sylmar
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- Information Bureaus & Services, Sylmar
- Inspection & Testing Services, Sylmar
- Inspection Equipment, Sylmar
- Insulation & Energy Conservation Materials, Sylmar
- Insulation Contractors, Sylmar - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Sylmar
- Insurance Farm, Sylmar
- Insurance General Liability, Sylmar
- Insurance Motorcycles, Sylmar
- Insurance Renters, Sylmar
- International Restaurants, Sylmar
- Internet Development, Sylmar
- Internet Entertainment, Sylmar - Internet Services
- Internet Home Page Development & Consulting, Sylmar
- Internet Providers, Sylmar
- Internet Services, Sylmar
- Internet Websites, Sylmar - Web Hosting, etc
- Investment Services & Advisors, Sylmar
- Iron Work Contractors, Sylmar
- Irrigation Systems & Equipment, Sylmar
- Italian Restaurants, Sylmar
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