- Dairy Products - Wholesale & Retail, Torrington
- Dance Companies, Torrington
- Day Spas, Torrington
- Decorating & Designing Services, Torrington
- Delicatessen Restaurants, Torrington
- Demolition Work, Torrington
- Dental Bonding & Cosmetic Dentistry, Torrington - Cosmetic Dentist & Tooth Bonding
- Dentists, Torrington
- Department Stores, Torrington
- Dermatologists, Torrington - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Disabilities, Torrington
- Diesel, Torrington - Engine Fuels, Oils & Lubricants
- Diesel Engine Repair & Service, Torrington
- Digital Printing & Imaging Service, Torrington
- Diner Restaurants, Torrington
- Direct Mail Advertising, Torrington
- Direct Mail Advertising Services, Torrington
- Dirt, Torrington
- Disability And Social Security Attorneys & Lawyers, Torrington
- Disabled Persons Assistive Services, Torrington
- Discount Stores, Torrington - Clothing, Grocery, Furniture, Etc
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- Dispensing Machines, Torrington
- Displays & Display Installation Service, Torrington - Trade Show Displays
- Divorce & Family Law Attorneys & Lawyers, Torrington
- Doctors, Physicians & Surgeons, Torrington
- Donuts, Torrington
- Door & Gate Operating Devices, Torrington
- Door Installation & Repair, Torrington - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Drainage Contractors, Torrington - Install & Repair Drainage Systems
- Drama Schools, Torrington
- Drinking Establishments, Torrington
- Driveway Contractors - Build, Repair, Sealing, Torrington - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Driveway, Parking Lot & Blacktop Contractors, Torrington - Construction, Repair & Maintenance
- Driving Proficiency Testing, Torrington
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Torrington
- Dry Cleaning & Laundry, Torrington - Dry Cleaners
- Drywall Contractors, Torrington - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Torrington - Installation & Repair Services
- DUI Attorneys & Lawyers, Torrington - DWI - Drunk Driving
- DUI Attorneys & Lawyers, Torrington - DWI - Drunk Driving
- DUI Lawyers & Attorneys, Torrington - DWI - Drunk Driving
- Dwelling Operators Except Apartment, Torrington
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