- Baby Stores, San Anselmo - Baby Accessories & Clothes
- Bagels, San Anselmo
- Bakeries, San Anselmo
- Banks, San Anselmo
- Baptist Churches, San Anselmo
- Barbers, San Anselmo
- Bars, San Anselmo
- Bars & Grills, San Anselmo
- Beauty Salons, San Anselmo
- Bed & Breakfast, San Anselmo
- Beer Taverns, San Anselmo
- Beverage Alcoholic, San Anselmo
- Beverage Stores, San Anselmo
- Beverages, San Anselmo
- Bicycle Repair & Service, San Anselmo - Bike Repair Shops
- Bicycle Shops, San Anselmo - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Bistros, San Anselmo
- Board Of Education, San Anselmo
- Bonds, San Anselmo
- Book Publishers, San Anselmo - Book Printing & Publishing
- Book Stores, San Anselmo
- Bookkeeping Services Commercial, San Anselmo
- Bookkeeping Services Licensed, San Anselmo
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- Bookkeeping Systems & Services, San Anselmo
- Books, Magazines & Newspapers Stores, San Anselmo - Bookstores
- Bottling Manufacturing, San Anselmo
- Boutiques & Boutique Items, San Anselmo
- Breakfast Restaurants, San Anselmo
- Brick Masonry & Bricklayer Contractors, San Anselmo - Brick Mason - Install & Repair
- Builders & Contractors, San Anselmo
- Builders & Contractors - More, San Anselmo
- Builders Hardware Stores, San Anselmo
- Building & Home Inspection, San Anselmo - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, San Anselmo - Construction Management & Consulting
- Building Design & Construction Consultants, San Anselmo
- Building Materials & Supplies, San Anselmo
- Burglar Alarm Systems, San Anselmo
- Business & Professional Associations, San Anselmo
- Business & Trade Organizations, San Anselmo
- Business Brokers, San Anselmo
- Business Communication Consultants, San Anselmo
- Business Legal Services, San Anselmo
- Business Management Consultants, San Anselmo
- Business Services, San Anselmo
- Business, Vocational & Technical, San Anselmo
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