- Dams, Waterways, & Docks Contractors, Port Colborne
- Dance Companies, Port Colborne
- Day Spas, Port Colborne
- Debt Management Assistance & Services, Port Colborne
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Port Colborne
- Decorating & Designing Services, Port Colborne
- Dentists, Port Colborne
- Denturists, Port Colborne
- Department Stores, Port Colborne
- Diamonds & Precious & Semi-Precious Stones, Port Colborne
- Direct Mail Advertising Services, Port Colborne
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- Disc Jockeys, Port Colborne
- Discount Stores, Port Colborne - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Port Colborne
- Doctors, Physicians & Surgeons, Port Colborne
- Drinking Establishments, Port Colborne
- Drive In Restaurants, Port Colborne
- Dry Cleaning & Laundry, Port Colborne - Dry Cleaners
- Drywall Contractors, Port Colborne - Drywall Repair & Installation Services
- Durable & Non Durable Goods & Products, Port Colborne
- Durable Goods & Products, Port Colborne
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