- Bail Bonds, Guilford
- Baked Goods, Snacks & Sweets, Guilford
- Bakeries, Guilford
- Banks, Guilford
- Banquet Halls, Guilford
- Banquet Halls, Reception Halls & Party Facilities, Guilford
- Barber Shops, Guilford
- Barbers, Guilford
- Bars, Guilford
- Bars & Grills, Guilford
- Baseball Little Leagues, Guilford
- Bathroom Accessories & Fixtures, Guilford - Bath Accessories, Vanity & Mirrors
- Bathroom Remodeling, Guilford - Bathroom Remodel & Planning Services
- Beauty Salons, Guilford
- Bedroom Furniture Stores, Guilford - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Guilford - Bee Removal Companies
- Beer & Wine Stores, Guilford
- Beer Taverns, Guilford
- Beverage Stores, Guilford
- Bicycle Repair & Service, Guilford - Bike Repair Shops
- Bicycle Shops, Guilford - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Biological Research, Guilford - Biological Labs
- Biotechnology Products & Services, Guilford
- Bistros, Guilford
- Boat Services, Guilford
- Boat Trailers, Guilford
- Boats & Yachts, Guilford - Yachts, Sailboats & Boats for Sale
- Boiler Repair & Cleaning, Guilford
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- Bonds, Guilford
- Book Stores, Guilford
- Bookkeeping Services Commercial, Guilford
- Bookkeeping Systems & Services, Guilford
- Books, Magazines & Newspapers Stores, Guilford - Bookstores
- Bottled Gas, Lp Gas & Propane Dealers, Guilford
- Boutiques & Boutique Items, Guilford
- Brake Service & Repair, Guilford - Brake Pads
- Breakfast Restaurants, Guilford
- Brick Masonry & Bricklayer Contractors, Guilford - Brick Mason - Install & Repair
- Bronze Tablets, Guilford
- Builders & Contractors, Guilford
- Builders & Contractors - More, Guilford
- Building Construction Consultants, Guilford - Construction Management & Consulting
- Building Hardware & Materials, Guilford
- Building Materials, Guilford - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Guilford
- Burglar Alarm Systems, Guilford
- Bus Lines, Guilford - Bus Transportation
- Bus Rental & Charter Bus Service, Guilford
- Business & Professional Associations, Guilford
- Business Forms, Systems & Supplies, Guilford
- Business Insurance, Guilford
- Business Legal Services, Guilford
- Business Management Consultants, Guilford
- Business Services, Guilford
- Business, Vocational & Technical, Guilford
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