- Dairy Products - Wholesale & Retail, Markham
- Dance Companies, Markham
- Data Communications Service, Equipment, Supplies & Sales, Markham
- Data Processing Services, Markham
- Data Recovery Services, Markham - Hard Drive Data Recovery, etc
- Day Spas, Markham
- Debt Management Assistance & Services, Markham
- Decals, Markham
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Markham
- Decorating & Designing Services, Markham
- Dehumidifying & Ventilating Equipment, Markham - Suppliers & Wholesalers
- Delicatessen Restaurants, Markham
- Dental Certified Specialists, Markham
- Dental Clinics, Markham
- Dental Hygienists, Markham
- Dental Service Organizations, Markham
- Dental Supplies & Equipment, Markham
- Dentists, Markham
- Denturists, Markham
- Department Stores, Markham
- Desktop Publishing, Markham
- Dessert Restaurants, Markham
- Diabetic Equipment & Supplies, Markham
- Diabetic Equipment Supplies & Services, Markham
- Diaper Products, Markham
- Diaper Service, Markham
- Dictating Machines, Markham
- Die Casting, Markham
- Die Cutting Machine, Supplies & Equipment, Markham
- Dies, Markham
- Diesel Engine, Markham
- Dietetic Restaurants, Markham
- Dieticians & Diet Counseling, Markham
- Digital Printers, Markham
- Digital Printing & Imaging Service, Markham
- Dim Sum Restaurants, Markham
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- Direct Magazine Sales & Delivery, Markham
- Direct Mail Advertising, Markham
- Direct Mail Advertising Services, Markham
- Direct Marketing, Markham
- Direct Selling Businesses, Markham
- Dirt, Markham
- Disc Jockeys, Markham
- Discount Stores, Markham - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Markham
- Dispensing Machines, Markham
- Display Fixtures & Materials, Markham
- Displays & Display Installation Service, Markham - Trade Show Displays
- Distribution Centers, Markham
- Distribution Services, Markham
- Divorce & Family Law Attorneys & Lawyers, Markham
- Doctors, Physicians & Surgeons, Markham
- Donuts, Markham
- Door Installation & Repair, Markham - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Markham - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Doors Glass & Mirrors, Markham
- Doors Rolling & Sliding, Markham
- Drainage Contractors, Markham - Install & Repair Drainage Systems
- Draperies & Curtains Manufacturers, Markham
- Drapery Hardware & Blinds & Shades Manufacturers, Markham
- Dressmakers Supplies, Markham
- Drinking Establishments, Markham
- Driveway, Parking Lot & Blacktop Contractors, Markham - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Markham
- Dry Cleaning & Laundry, Markham - Dry Cleaners
- Drywall Contractors, Markham - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Markham - Installation & Repair Services
- Dunlop Tires, Markham - Dealers
- Durable & Non Durable Goods & Products, Markham
- Durable Goods & Products, Markham
- Dwelling Operators Except Apartment, Markham
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