- Dairy Products - Wholesale & Retail, North Haven
- Dams, Waterways, & Docks Contractors, North Haven
- Dance Companies, North Haven
- Data Processing Services, North Haven
- Data Recovery Services, North Haven - Hard Drive Data Recovery, etc
- Day Spas, North Haven
- Decorating & Designing Services, North Haven
- Decorative & Stamped Concrete, North Haven
- Delicatessen Restaurants, North Haven
- Delivery & Errand Services, North Haven
- Dental Bonding & Cosmetic Dentistry, North Haven - Cosmetic Dentist & Tooth Bonding
- Dental Clinics, North Haven
- Dentists, North Haven
- Department Stores, North Haven
- Developmental Disabilities, North Haven
- Developmentally Disabled Information & Services, North Haven
- Dialysis Clinics, North Haven - Kidney Dialysis Centers
- Diamonds & Precious & Semi-Precious Stones, North Haven
- Diesel, North Haven - Engine Fuels, Oils & Lubricants
- Digital Printing & Imaging Service, North Haven
- Diner Restaurants, North Haven
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- Direct Mail Advertising, North Haven
- Direct Mail Advertising Services, North Haven
- Disc Jockeys, North Haven
- Discount Stores, North Haven - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, North Haven
- Dispensing Machines, North Haven
- Divorce & Family Law Attorneys & Lawyers, North Haven
- Doctors, Physicians & Surgeons, North Haven
- Donuts, North Haven
- Door & Gate Operating Devices, North Haven
- Door Closers & Checks, North Haven
- Doors & Door Frames, North Haven - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drains, Pipes & Sewage Materials, North Haven
- Drinking Establishments, North Haven
- Driveway, Parking Lot & Blacktop Contractors, North Haven - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, North Haven
- Dry Cleaning & Laundry, North Haven - Dry Cleaners
- Drywall Contractors, North Haven - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, North Haven
- Drywall, Insulation & Plaster Contractors, North Haven - Installation & Repair Services
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