- Baby Stores, Southington - Baby Accessories & Clothes
- Bagels, Southington
- Bail Bonds, Southington
- Bakeries, Southington
- Baking Supplies & Needs, Southington - Flavoring Extracts, Flour & More
- Banks, Southington
- Banquet Halls, Reception Halls & Party Facilities, Southington
- Baptist Churches, Southington
- Barbecue Restaurants, Southington
- Barbers, Southington
- Bars, Southington
- Bars & Grills, Southington
- Baseball Little Leagues, Southington
- Bathroom Fixtures, Southington - Bathroom Faucets, Bathtubs, Sinks, Shower Heads & Fixtures, etc
- Bathroom Remodeling, Southington - Bathroom Remodel & Planning Services
- Battery, Southington - Retail Batteries Stores
- Battery Storage, Southington
- Beach & Water Related Services, Southington
- Beauty Salons, Southington
- Bedding & Linens Stores, Southington - Bed Sheets, Quilts and Coverlets, Cushions, Pillows, Slipcovers & Bed & Table Linens
- Bedroom Furniture Stores, Southington - Master & Kids Bedroom Furniture Sets & Beds
- Bee Control & Removal Services, Southington - Bee Removal Companies
- Behavioral Health Doctors, Physicians & Surgeons, Southington - Behavioral Medicine
- Bereavement Services, Southington
- Beverage & Juice Bottlers Manufacturers, Southington
- Beverage Non-Alcoholic Manufacturers, Southington
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- Beverage Stores, Southington
- Billiard & Pool Parlors, Southington
- Boiler Repair & Cleaning, Southington
- Bonds, Southington
- Book Stores, Southington
- Bottling Manufacturing, Southington
- Brake Lining Manufacturers, Southington
- Brake Service & Repair, Southington - Brake Pads
- Breakfast Restaurants, Southington
- Brick Masonry & Bricklayer Contractors, Southington - Brick Mason - Install & Repair
- Brick Walkways & Patios, Southington
- Bricks, Blocks & Stone Products, Southington - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, Southington
- Builders & Contractors - More, Southington
- Building Construction Consultants, Southington - Construction Management & Consulting
- Building Hardware & Materials, Southington
- Building Materials, Southington - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Southington
- Building Site Preparation Contractors, Southington - Land Preparation & Land Clearing
- Burglar Alarm Systems, Southington
- Business & Professional Associations, Southington
- Business Insurance, Southington
- Business Legal Services, Southington
- Business Services, Southington
- Business Wholesale, Southington
- Business, Vocational & Technical, Southington
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