- Dairy Products - Wholesale & Retail, Port Hope
- Day Spas, Port Hope
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Port Hope
- Decorating & Designing Services, Port Hope
- Delicatessen Restaurants, Port Hope
- Dental Clinics, Port Hope
- Dental Hygiene - Products & Supplies, Port Hope
- Dental Hygienists, Port Hope
- Dental Laboratories, Port Hope
- Dentists, Port Hope
- Denturists, Port Hope
- Diner Restaurants, Port Hope
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- Dock Construction - Build & Repair, Port Hope - Dock Builders
- Doctors, Physicians & Surgeons, Port Hope
- Donuts, Port Hope
- Drafting Services, Port Hope
- Drainage Contractors, Port Hope - Install & Repair Drainage Systems
- Drinking Establishments, Port Hope
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Port Hope
- Dry Cleaning & Laundry, Port Hope - Dry Cleaners
- Drywall Contractors, Port Hope - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Port Hope - Installation & Repair Services
- Dwelling Operators Except Apartment, Port Hope
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