- Dairy Products - Wholesale & Retail, Ridgefield
- Dance Companies, Ridgefield
- Dancing Instructions, Ridgefield
- Data Communications Service, Equipment, Supplies & Sales, Ridgefield
- Data Processing Services, Ridgefield
- Day Spas, Ridgefield
- Decorating & Designing Services, Ridgefield
- Delicatessen Restaurants, Ridgefield
- Delivery & Errand Services, Ridgefield
- Dentists, Ridgefield
- Dieticians & Diet Counseling, Ridgefield
- Digital Printing & Imaging Service, Ridgefield
- Diner Restaurants, Ridgefield
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- Direct Mail Advertising Services, Ridgefield
- Doctors, Physicians & Surgeons, Ridgefield
- Donuts, Ridgefield
- Door & Gate Operating Devices, Ridgefield
- Doors & Door Frames, Ridgefield - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Ridgefield
- Drainage Contractors, Ridgefield - Install & Repair Drainage Systems
- Drinking Establishments, Ridgefield
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Ridgefield
- Dry Cleaning & Laundry, Ridgefield - Dry Cleaners
- Durable & Non Durable Goods & Products, Ridgefield
- Durable Goods & Products, Ridgefield
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