- Bail Bonds, Altadena
- Bakeries, Altadena
- Balloon Decorating, Altadena
- Balloon Manufacturers, Altadena
- Balloons, Altadena
- Banks, Altadena
- Baptist Churches, Altadena
- Barber Shops, Altadena
- Barbers, Altadena
- Bars, Altadena
- Bars & Grills, Altadena
- Bathtubs & Sinks - Repair & Refinishing, Altadena - Bathtub Refinishing, Repair & Resurfacing
- Beauty Salons, Altadena
- Beer & Wine Stores, Altadena
- Beer Taverns, Altadena
- Beverage Stores, Altadena
- Bible Church, Altadena
- Bicycle Shops, Altadena - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billing Services, Altadena
- Book Stores, Altadena
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- Bookkeeping Services Commercial, Altadena
- Bookkeeping Services Licensed, Altadena
- Bookkeeping Systems & Services, Altadena
- Books, Magazines & Newspapers Stores, Altadena - Bookstores
- Breakfast Restaurants, Altadena
- Brick Masonry & Bricklayer Contractors, Altadena - Brick Mason - Install & Repair
- Builders & Contractors, Altadena
- Builders & Contractors - More, Altadena
- Builders Hardware Stores, Altadena
- Building Construction Consultants, Altadena - Construction Management & Consulting
- Building Design & Construction Consultants, Altadena
- Building Materials, Altadena - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Altadena
- Business & Professional Associations, Altadena
- Business Insurance, Altadena
- Business Legal Services, Altadena
- Business Management Consultants, Altadena
- Business Services, Altadena
- Business Studio Rental, Altadena
- Business, Vocational & Technical, Altadena
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