- Bagels, Plainville
- Bail Bonds, Plainville
- Baker Equipment & Supplies, Plainville - Donut Maker, etc
- Bakeries, Plainville
- Balloons, Plainville
- Banks, Plainville
- Banners, Flags, Pennants, Decals, Posters & Signs, Plainville
- Banquet Halls, Plainville
- Banquet Halls, Reception Halls & Party Facilities, Plainville
- Baptist Churches, Plainville
- Barber Shops, Plainville
- Barbers, Plainville
- Bars, Plainville
- Bars & Grills, Plainville
- Baseball & Softball Batting Ranges, Plainville
- Baseball Little Leagues, Plainville
- Bath Equipment & Supplies, Plainville
- Bathroom Fixtures, Plainville - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Plainville - Bathroom Remodel & Planning Services
- Beauty Salons, Plainville
- Bedroom Furniture Stores, Plainville - Master & Kids Bedroom Furniture Sets & Beds
- Beer Taverns, Plainville
- Beverage Stores, Plainville
- Beverages, Plainville
- Bible Church, Plainville
- Bicycle Rentals, Plainville - Bike Rental
- Bicycle Repair & Service, Plainville - Bike Repair Shops
- Bicycle Shops, Plainville - Road, Hybrid, Folding, BMX, Electric & Mountain Bikes Stores & Dealers
- Billiard & Pool Table Repair & Service, Plainville
- Birth Control & Family Planning Clinics, Plainville
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- Bistros, Plainville
- Blueprint Service, Plainville - Blueprinting Services
- Bonds Surety & Fidelity, Plainville
- Bookkeeping Services Commercial, Plainville
- Bookkeeping Systems & Services, Plainville
- Bottled Gas, Lp Gas & Propane Dealers, Plainville
- Boutiques & Boutique Items, Plainville
- Bowling Apparel & Accessories, Plainville
- Bowling Centers, Plainville
- Brake Service & Repair, Plainville - Brake Pads
- Breakfast Restaurants, Plainville
- Brick Masonry & Bricklayer Contractors, Plainville - Brick Mason - Install & Repair
- Buffet Restaurants, Plainville
- Builders & Contractors, Plainville
- Builders & Contractors - More, Plainville
- Builders Hardware Stores, Plainville
- Building & Property Maintenance & Services, Plainville
- Building Construction Consultants, Plainville - Construction Management & Consulting
- Building Hardware & Materials, Plainville
- Building Materials, Plainville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Plainville
- Building Restoration & Preservation, Plainville
- Building Site Preparation Contractors, Plainville - Land Preparation & Land Clearing
- Burglar Alarm Systems, Plainville
- Business & Professional Associations, Plainville
- Business Insurance, Plainville
- Business Legal Services, Plainville
- Business Management Consultants, Plainville
- Business Services, Plainville
- Business, Vocational & Technical, Plainville
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