- Baker Equipment & Supplies, San Ysidro - Donut Maker, etc
- Bakeries, San Ysidro
- Bank Supplies & Equipment, San Ysidro
- Banks, San Ysidro
- Baptist Churches, San Ysidro
- Bars & Grills, San Ysidro
- Battery, San Ysidro - Retail Batteries Stores
- Battery Storage, San Ysidro
- Beauty Salons, San Ysidro
- Bird Cages & Accessories, San Ysidro
- Birds, San Ysidro
- Birds & Bird Supplies , San Ysidro
- Boat Covers, Tops & Upholstery, San Ysidro
- Boats & Yachts, San Ysidro - Yachts, Sailboats & Boats for Sale
- Bookkeeping Services Commercial, San Ysidro
- Bookkeeping Systems & Services, San Ysidro
- Boutiques & Boutique Items, San Ysidro
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- Bras & Lingerie, San Ysidro
- Breakfast Restaurants, San Ysidro
- Brokers Merchandise, San Ysidro
- Buffet Restaurants, San Ysidro
- Builders & Contractors, San Ysidro
- Builders & Contractors - More, San Ysidro
- Builders Hardware Stores, San Ysidro
- Building Materials & Supplies, San Ysidro
- Bus Lines, San Ysidro - Bus Transportation
- Bus Lines Ticket Agencies, San Ysidro
- Bus Rental & Charter Bus Service, San Ysidro
- Business Brokers, San Ysidro
- Business Insurance, San Ysidro
- Business Legal Services, San Ysidro
- Business Management Consultants, San Ysidro
- Business Services, San Ysidro
- Business, Vocational & Technical, San Ysidro
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