- Day Spas, Darien
- Decorating & Designing Services, Darien
- Dental Equipment Repair & Refinish, Darien
- Dental Supplies & Equipment, Darien
- Dentists, Darien
- Department Stores, Darien
- Dermatologists, Darien - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Children Services, Darien
- Diet Center, Darien
- Diet Centers, Darien
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- Direct Mail Advertising, Darien
- Direct Mail Advertising Services, Darien
- Diving Instruction, Darien
- Doctors, Physicians & Surgeons, Darien
- Donuts, Darien
- Drinking Establishments, Darien
- Dry Cleaning & Laundry, Darien - Dry Cleaners
- Dryer Vent Cleaning, Repair & Installation, Darien
- Durable & Non Durable Goods & Products, Darien
- Durable Goods & Products, Darien
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