- Dance Companies, Southbury
- Day Spas, Southbury
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Southbury
- Decorating & Designing Services, Southbury
- Delicatessen Restaurants, Southbury
- Dental Bonding & Cosmetic Dentistry, Southbury - Cosmetic Dentist & Tooth Bonding
- Dentists, Southbury
- Department Stores, Southbury
- Die Makers Equipment & Supplies, Southbury
- Dies, Southbury
- Diner Restaurants, Southbury
- Direct Mail Advertising Services, Southbury
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- Direct Newspaper Sales & Delivery, Southbury
- Direct Selling Businesses, Southbury
- Dirt, Southbury
- Disc Jockeys, Southbury
- Doctorate Degree, Southbury
- Doctors, Physicians & Surgeons, Southbury
- Donuts, Southbury
- Door Glass & Mirrors, Southbury
- Doors & Door Frames, Southbury - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drainage Contractors, Southbury - Install & Repair Drainage Systems
- Dry Cleaning & Laundry, Southbury - Dry Cleaners
- Durable & Non Durable Goods & Products, Southbury
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