- Dairy Farms, New Britain
- Dance Companies, New Britain
- Data Communications Service, Equipment, Supplies & Sales, New Britain
- Day Spas, New Britain
- Decorating & Designing Services, New Britain
- Decorative Wood Products Manufacturers, New Britain
- Delicatessen Restaurants, New Britain
- Dental Hygienists, New Britain
- Dentists, New Britain
- Department Stores, New Britain
- Diner Restaurants, New Britain
- Direct Mail Advertising, New Britain
- Direct Mail Advertising Services, New Britain
- Discount Stores, New Britain - Clothing, Grocery, Furniture, Etc
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- Disease, Handicap & Disability Services, Organizations & Groups, New Britain
- Dispensing Machines, New Britain
- Divorce & Family Law Attorneys & Lawyers, New Britain
- Doctors, Physicians & Surgeons, New Britain
- Donuts, New Britain
- Drinking Establishments, New Britain
- Driveway Contractors - Build, Repair, Sealing, New Britain - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Driving Proficiency Testing, New Britain
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, New Britain
- Dry Cleaning & Laundry, New Britain - Dry Cleaners
- Drywall Contractors, New Britain - Drywall Repair & Installation Services
- Durable & Non Durable Goods & Products, New Britain
- Durable Goods & Products, New Britain
- Dwelling Operators Except Apartment, New Britain
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