- Ice Cream & Frozen Yogurt, San Anselmo
- Image Consultants Personal, San Anselmo
- Industrial & Commercial Cleaning Services & Companies, San Anselmo
- Industrial & Personal Service Paper, Boxes & Cardboard, San Anselmo
- Industrial Contractors, San Anselmo
- Industrial Goods & Products - Hard Goods - Large, San Anselmo
- Industrial Goods & Products - Soft - Large & Small, San Anselmo
- Industry, San Anselmo
- Information Bureaus & Services, San Anselmo
- Information Retrieval Services, San Anselmo
- Inspection & Testing Services, San Anselmo
- Insurance Brokers, San Anselmo
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- Insurance Carriers, San Anselmo
- Insurance Farm, San Anselmo
- Insurance Services, San Anselmo
- Interior Designers, San Anselmo
- Interior Designers & Decorators, San Anselmo
- Internet Development, San Anselmo
- Internet Home Page Development & Consulting, San Anselmo
- Internet Marketing & Advertising Services, San Anselmo
- Internet Services, San Anselmo
- Investment Management Services, San Anselmo
- Investment Services & Advisors, San Anselmo
- Investments & Mutual Funds, San Anselmo
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