- Dairy Farm Equipment, Branford
- Dance Companies, Branford
- Data Processing Services, Branford
- Day Spas, Branford
- Debt Adjusters, Branford
- Debt Management Assistance & Services, Branford
- Decorating & Designing Services, Branford
- Decorative & Stamped Concrete, Branford
- Delicatessen Restaurants, Branford
- Delivery & Errand Services, Branford
- Demolition Work, Branford
- Dentists, Branford
- Department Stores, Branford
- Dessert Restaurants, Branford
- Developmental Disabilities, Branford
- Dialysis Clinics, Branford - Kidney Dialysis Centers
- Diesel, Branford - Engine Fuels, Oils & Lubricants
- Diesel Engine, Branford
- Diet Center, Branford
- Diet Centers, Branford
- Dieticians & Diet Counseling, Branford
- Digital Printing & Imaging Service, Branford
- Diner Restaurants, Branford
- Dining Room Furniture Formal, Branford
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- Direct Mail Advertising Services, Branford
- Disability Accommodation Consultants, Branford
- Discount Stores, Branford - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Branford
- Divers & Diving Professionals, Branford
- Divorce & Family Law Attorneys & Lawyers, Branford
- Doctorate Degree, Branford
- Doctors, Physicians & Surgeons, Branford
- Document Imaging & Management, Branford
- Donuts, Branford
- Door & Gate Operating Devices, Branford
- Drama Schools, Branford
- Draperies & Curtain Fabric Stores, Branford
- Drinking Establishments, Branford
- Driveway Contractors - Build, Repair, Sealing, Branford - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Branford
- Dry Cleaning & Laundry, Branford - Dry Cleaners
- Dry Cleaning Equipment & Supplies, Branford
- Drywall Equipment & Supplies, Branford
- Drywall, Insulation & Plaster Contractors, Branford - Installation & Repair Services
- Dump Truck, Branford
- Durable & Non Durable Goods & Products, Branford
- Durable Goods & Products, Branford
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