- Bagel Restaurants, Millbrae
- Bagels, Millbrae
- Bakeries, Millbrae
- Balloon Decorating, Millbrae
- Balloons, Millbrae
- Bank Supplies & Equipment, Millbrae
- Banks, Millbrae
- Banquet Halls, Reception Halls & Party Facilities, Millbrae
- Barbecue Restaurants, Millbrae
- Barber Shops, Millbrae
- Barbers, Millbrae
- Bars & Grills, Millbrae
- Basement Waterproofing - Waterproofing Contractors, Millbrae - Foundation & Concrete Waterproofing
- Beauty Salons, Millbrae
- Bedroom Furniture Stores, Millbrae - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Millbrae
- Beverage & Juice Bottlers Manufacturers, Millbrae
- Beverage Non-Alcoholic Manufacturers, Millbrae
- Beverage Stores, Millbrae
- Bistros, Millbrae
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- Blasting Contractors Supplies & Equipment, Millbrae
- Boiler & Furnace Contractors, Millbrae - Installation, Cleaning & Repair Services
- Boot Manufacturers, Millbrae
- Boots Retail, Millbrae
- Bottling Manufacturing, Millbrae
- Brake Service & Repair, Millbrae - Brake Pads
- Breakfast Restaurants, Millbrae
- Builders & Contractors, Millbrae
- Builders & Contractors - More, Millbrae
- Builders Hardware Stores, Millbrae
- Building Construction Consultants, Millbrae - Construction Management & Consulting
- Building Materials, Millbrae - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Millbrae
- Burglar Alarm Systems, Millbrae
- Business & Professional Associations, Millbrae
- Business & Trade Organizations, Millbrae
- Business Brokers, Millbrae
- Business Insurance, Millbrae
- Business Legal Services, Millbrae
- Business Services, Millbrae
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