- Dairy Products - Wholesale & Retail, Norwalk
- Dance Companies, Norwalk
- Dancing Instructions, Norwalk
- Darts & Dart Boards Supplies, Norwalk
- Data Communications Service, Equipment, Supplies & Sales, Norwalk
- Day Spas, Norwalk
- Decorating & Designing Services, Norwalk
- Delicatessen Restaurants, Norwalk
- Delivery & Errand Services, Norwalk
- Demolition Work, Norwalk
- Dental Bonding & Cosmetic Dentistry, Norwalk - Cosmetic Dentist & Tooth Bonding
- Dental Supplies & Equipment, Norwalk
- Dentists, Norwalk
- Department Stores, Norwalk
- Dermatologists, Norwalk - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designers, Norwalk
- Developmental Disabilities, Norwalk
- Diabetes Services & Supplies, Norwalk - Educational, Referral & Support Service Centers
- Dialysis Clinics, Norwalk - Kidney Dialysis Centers
- Digital Printing & Imaging Service, Norwalk
- Diner Restaurants, Norwalk
- Direct Magazine Sales & Delivery, Norwalk
- Direct Mail Advertising, Norwalk
- Direct Mail Advertising Services, Norwalk
- Direct Marketing, Norwalk
- Direct Newspaper Sales & Delivery, Norwalk
- Direct Selling Businesses, Norwalk
- Dirt, Norwalk
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- Disability Accommodation Consultants, Norwalk
- Disc Jockeys, Norwalk
- Discount Stores, Norwalk - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Norwalk
- Dispensing Machines, Norwalk
- Displays & Display Installation Service, Norwalk - Trade Show Displays
- Diving Instruction, Norwalk
- Divorce & Family Law Attorneys & Lawyers, Norwalk
- Doctorate Degree, Norwalk
- Doctors, Physicians & Surgeons, Norwalk
- Dog & Cat Foods, Norwalk
- Donuts, Norwalk
- Door & Gate Operating Devices, Norwalk
- Drafting Equipment, Norwalk
- Drafting Services, Norwalk
- Drainage Contractors, Norwalk - Install & Repair Drainage Systems
- Drama Schools, Norwalk
- Draperies & Curtain Fabric Stores, Norwalk
- Dressmakers Supplies, Norwalk
- Drinking Establishments, Norwalk
- Driveway Contractors - Build, Repair, Sealing, Norwalk - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Norwalk
- Dry Cleaning & Laundry, Norwalk - Dry Cleaners
- Drywall Contractors, Norwalk - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Norwalk - Installation & Repair Services
- Dump Truck, Norwalk
- Durable & Non Durable Goods & Products, Norwalk
- Durable Goods & Products, Norwalk
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