- Dairy Farms, Brantford
- Dairy Products - Wholesale & Retail, Brantford
- Dance Companies, Brantford
- Data Processing Services, Brantford
- Day Spas, Brantford
- Debt Management Assistance & Services, Brantford
- Decals, Brantford
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Brantford
- Decorating & Designing Services, Brantford
- Delicatessen Products Manufacturers, Brantford
- Delicatessen Restaurants, Brantford
- Dental Supplies & Equipment, Brantford
- Dentists, Brantford
- Denturists, Brantford
- Department Stores, Brantford
- Diabetes Centers, Brantford
- Diamonds & Precious & Semi-Precious Stones, Brantford
- Diesel, Brantford - Engine Fuels, Oils & Lubricants
- Dieticians & Diet Counseling, Brantford
- Digital Printing & Imaging Service, Brantford
- Diner Restaurants, Brantford
- Direct Mail Advertising, Brantford
- Direct Mail Advertising Services, Brantford
- Dirt, Brantford
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- Disc Jockeys, Brantford
- Discount Stores, Brantford - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Brantford
- Dispensing Machines, Brantford
- Distribution Centers, Brantford
- Distribution Services, Brantford
- Doctors, Physicians & Surgeons, Brantford
- Donuts, Brantford
- Door Installation & Repair, Brantford - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Brantford - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drainage Contractors, Brantford - Install & Repair Drainage Systems
- Dressmakers Supplies, Brantford
- Drinking Establishments, Brantford
- Driveway, Parking Lot & Blacktop Contractors, Brantford - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Brantford
- Dry Cleaning & Laundry, Brantford - Dry Cleaners
- Dryers Sales, Service & Repair, Brantford - Gas & Electric
- Drywall Contractors, Brantford - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Brantford - Installation & Repair Services
- Dunlop Tires, Brantford - Dealers
- Durable & Non Durable Goods & Products, Brantford
- Durable Goods & Products, Brantford
- Dwelling Operators Except Apartment, Brantford
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