- Bakeries, Castroville
- Banks, Castroville
- Banners, Flags, Pennants, Decals, Posters & Signs, Castroville
- Barbecue Restaurants, Castroville
- Bars, Castroville
- Bars & Grills, Castroville
- Beauty Salons, Castroville
- Bed & Breakfast, Castroville
- Beer & Wine Stores, Castroville
- Beer Taverns, Castroville
- Billing Services, Castroville
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- Bonds, Castroville
- Bottled Gas, Lp Gas & Propane Dealers, Castroville
- Builders & Contractors, Castroville
- Builders & Contractors - More, Castroville
- Building Materials & Supplies, Castroville
- Burglar Alarm Systems, Castroville
- Business & Professional Associations, Castroville
- Business Brokers, Castroville
- Business Legal Services, Castroville
- Business Services, Castroville
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