- Dams, Waterways, & Docks Contractors, Torrington
- Day Spas, Torrington
- Delicatessen Restaurants, Torrington
- Dentists, Torrington
- Department Stores, Torrington
- Developmental Disabilities, Torrington
- Developmentally Disabled Information & Services, Torrington
- Diesel Engine Repair & Service, Torrington
- Discount Stores, Torrington - Clothing, Grocery, Furniture, Etc
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- Doctors, Physicians & Surgeons, Torrington
- Dolls Collectors, Torrington
- Dolls, Doll Houses & Accessories , Torrington
- Drinking Establishments, Torrington
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Torrington
- Dry Cleaning & Laundry, Torrington - Dry Cleaners
- Drywall Contractors, Torrington - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Torrington
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