- Dance Companies, New Canaan
- Dancing Instructions, New Canaan
- Day Spas, New Canaan
- Decorating & Designing Services, New Canaan
- Delicatessen Restaurants, New Canaan
- Dentists, New Canaan
- Dermatologists, New Canaan - Skin Doctors, Physicians & Surgeons (Dermatology)
- Diner Restaurants, New Canaan
- Direct Mail Advertising, New Canaan
- Direct Mail Advertising Services, New Canaan
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- Doctorate Degree, New Canaan
- Doctors, Physicians & Surgeons, New Canaan
- Donuts, New Canaan
- Drama Schools, New Canaan
- Drinking Establishments, New Canaan
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, New Canaan
- Dry Cleaning & Laundry, New Canaan - Dry Cleaners
- Dryers Sales, Service & Repair, New Canaan - Gas & Electric
- Durable & Non Durable Goods & Products, New Canaan
- Durable Goods & Products, New Canaan
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