- Backflow Prevention Devices & Services, Castro Valley
- Bagel Restaurants, Castro Valley
- Bagels, Castro Valley
- Bail Bonds, Castro Valley
- Bakeries, Castro Valley
- Balloons, Castro Valley
- Bank Supplies & Equipment, Castro Valley
- Bankruptcy Attorneys & Lawyers, Castro Valley
- Bankruptcy Attorneys & Lawyers, Castro Valley
- Bankruptcy Lawyers & Attorneys, Castro Valley
- Bankruptcy Services, Castro Valley
- Banks, Castro Valley
- Banners, Flags, Pennants, Decals, Posters & Signs, Castro Valley
- Banquet Halls, Reception Halls & Party Facilities, Castro Valley
- Baptist Churches, Castro Valley
- Barbecue Restaurants, Castro Valley
- Barber Shops, Castro Valley
- Barbers, Castro Valley
- Bariatricians, Castro Valley - Weight Loss Doctors, Physicians & Surgeons (Eating Disorders & Bariatric Medicine)
- Bars & Grills, Castro Valley
- Baseball Cards & Sports Memorabilia, Castro Valley
- Basement Waterproofing - Waterproofing Contractors, Castro Valley - Foundation & Concrete Waterproofing
- Beach & Water Related Services, Castro Valley
- Beads Decor, Castro Valley
- Beauty Salons, Castro Valley
- Beer & Wine Stores, Castro Valley
- Beverage Stores, Castro Valley
- Bible Church, Castro Valley
- Bicycle Shops, Castro Valley - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
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- Boat Fishing Charters & Tours, Castro Valley
- Boating & Swimming Clubs, Castro Valley
- Boiler & Furnace Contractors, Castro Valley - Installation, Cleaning & Repair Services
- Bonds, Castro Valley
- Book Stores, Castro Valley
- Bookkeeping Services Commercial, Castro Valley
- Bookkeeping Systems & Services, Castro Valley
- Books, Magazines & Newspapers Stores, Castro Valley - Bookstores
- Bowling Centers, Castro Valley
- Brake Service & Repair, Castro Valley - Brake Pads
- Breakfast Restaurants, Castro Valley
- Brick Masonry & Bricklayer Contractors, Castro Valley - Brick Mason - Install & Repair
- Builders & Contractors, Castro Valley
- Builders & Contractors - More, Castro Valley
- Builders Hardware Stores, Castro Valley
- Building & Property Maintenance & Services, Castro Valley
- Building Construction Consultants, Castro Valley - Construction Management & Consulting
- Building Materials, Castro Valley - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Castro Valley
- Building Site Preparation Contractors, Castro Valley - Land Preparation & Land Clearing
- Burglar Alarm Systems, Castro Valley
- Business & Professional Associations, Castro Valley
- Business Insurance, Castro Valley
- Business Legal Services, Castro Valley
- Business Management Consultants, Castro Valley
- Business Services, Castro Valley
- Business Wholesale, Castro Valley
- Business, Vocational & Technical, Castro Valley
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