- Baby Stores, Plainville - Baby Accessories & Clothes
- Bakeries, Plainville
- Bank Supplies & Equipment, Plainville
- Banks, Plainville
- Banquet Halls, Plainville
- Baptist Churches, Plainville
- Barbers, Plainville
- Bars, Plainville
- Bathing Accessories, Plainville
- Beauty Salons, Plainville
- Bedroom Furniture Stores, Plainville - Master & Kids Bedroom Furniture Sets & Beds
- Beer & Wine Stores, Plainville
- Beer Taverns, Plainville
- Beverage Stores, Plainville
- Bird Feeders & Supplies, Plainville
- Blankbooks & Looseleaf Binders Manufacturers, Plainville
- Boating & Swimming Clubs, Plainville
- Bonds, Plainville
- Book Stores, Plainville
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- Boutique Items Manufacturers, Plainville
- Brake Service & Repair, Plainville - Brake Pads
- Brakes & Brake Parts, Plainville - Brake Pads, Rotors, Calipers, Lines, etc
- Breakfast Restaurants, Plainville
- Builders & Contractors, Plainville
- Builders & Contractors - More, Plainville
- Building & Property Maintenance & Services, Plainville
- Building Cleaning - Exterior, Plainville - Cleaning Service
- Building Hardware & Materials, Plainville
- Building Materials, Plainville - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Plainville
- Building Site Preparation Contractors, Plainville - Land Preparation & Land Clearing
- Business Brokers, Plainville
- Business Insurance, Plainville
- Business Legal Services, Plainville
- Business Management Consultants, Plainville
- Business Services, Plainville
- Business, Vocational & Technical, Plainville
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