- Backflow Prevention Devices & Services, Downey
- Backhoe & Bulldozer Contractors, Downey - Backhoe & Dozer Services
- Bags, Downey - Paper, Plastic, Sand, Burlap, Canvas, Transparent, etc
- Bail Bonds, Downey
- Baked Goods, Snacks & Sweets, Downey
- Bakeries, Downey
- Baking Supplies & Needs, Downey - Flavoring Extracts, Flour & More
- Bank Supplies & Equipment, Downey
- Banks, Downey
- Banquet Halls, Downey
- Baptist Churches, Downey
- Barbecue Restaurants, Downey
- Barber Schools, Downey
- Barber Shop & Beauty Salon Supplies & Equipment, Downey - Beauty & Barber Supplies
- Barber Shops, Downey
- Barbers, Downey
- Bars, Downey
- Bars & Grills, Downey
- Baseball & Softball Batting Ranges, Downey
- Baseball Cards & Sports Memorabilia, Downey
- Baseball Little Leagues, Downey
- Bathroom Fixtures, Downey - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Battery, Downey - Retail Batteries Stores
- Battery Storage, Downey
- Beach & Water Related Services, Downey
- Beauty Consultants, Downey
- Beauty Salons, Downey
- Bedroom Furniture Stores, Downey - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Downey - Bee Removal Companies
- Beer Taverns, Downey
- Beverage & Juice Bottlers Manufacturers, Downey
- Beverage Non-Alcoholic Manufacturers, Downey
- Beverage Stores, Downey
- Beverages, Downey
- Bible Church, Downey
- Bicycle Shops, Downey - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Birth Control & Family Planning Clinics, Downey
- Blood Bank & Center, Downey
- Board Up Services Contractors, Downey
- Boat Documentation & Registration, Downey
- Boats & Yachts, Downey - Yachts, Sailboats & Boats for Sale
- Boiler - New & Used, Downey - Radiant Heating
- Bonds Surety & Fidelity, Downey
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- Bookkeeping Services Commercial, Downey
- Bookkeeping Services Licensed, Downey
- Bookkeeping Systems & Services, Downey
- Books, Magazines & Newspapers Stores, Downey - Bookstores
- Bottling Manufacturing, Downey
- Boutiques & Boutique Items, Downey
- Bowling Apparel & Accessories, Downey
- Bowling Centers, Downey
- Brake Service & Repair, Downey - Brake Pads
- Brakes & Brake Parts, Downey - Brake Pads, Rotors, Calipers, Lines, etc
- Branding Equipment, Downey
- Breakfast Restaurants, Downey
- Brick Masonry & Bricklayer Contractors, Downey - Brick Mason - Install & Repair
- Broker Consultants, Downey - Business Coaches & Consultants
- Buddhist Churches, Downey
- Buffet Restaurants, Downey
- Builders & Contractors, Downey
- Builders & Contractors - More, Downey
- Builders Hardware Stores, Downey
- Building & Home Inspection, Downey - Real Estate, Building, Land & House Inspection Service
- Building & Property Maintenance & Services, Downey
- Building Construction Consultants, Downey - Construction Management & Consulting
- Building Hardware & Materials, Downey
- Building Materials, Downey - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Downey
- Burglar Alarm Systems, Downey
- Bus & Other Large Specialty Vehicle Manufacturers, Downey
- Bus Lines, Downey - Bus Transportation
- Bus Parts Equipment & Supplies, Downey
- Bus Rental & Charter Bus Service, Downey
- Business & Professional Associations, Downey
- Business & Trade Organizations, Downey
- Business Brokers, Downey
- Business Cards, Downey
- Business Communication Consultants, Downey
- Business Forms, Systems & Supplies, Downey
- Business Insurance, Downey
- Business Legal Services, Downey
- Business Management Consultants, Downey
- Business Services, Downey
- Business Studio Rental, Downey
- Business, Vocational & Technical, Downey
- Butchers & Meat Markets - Manufacturers, Downey
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