- Dance Companies, Oakville
- Data Processing Services, Oakville
- Data Recovery Services, Oakville - Hard Drive Data Recovery, etc
- Day Spas, Oakville
- Debt Management Assistance & Services, Oakville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Oakville
- Decorating & Designing Services, Oakville
- Delicatessen Restaurants, Oakville
- Dental Bonding & Cosmetic Dentistry, Oakville - Cosmetic Dentist & Tooth Bonding
- Dental Clinics, Oakville
- Dental Hygienists, Oakville
- Dental Laboratories, Oakville
- Dental Supplies & Equipment, Oakville
- Dentists, Oakville
- Denturists, Oakville
- Deodorant, Disinfectants & Germicides, Oakville
- Department Stores, Oakville
- Designer Clothes & Accessories, Oakville
- Desktop Publishing, Oakville
- Diabetes Centers, Oakville
- Diamonds & Precious & Semi-Precious Stones, Oakville
- Die Casting, Oakville
- Diesel, Oakville - Engine Fuels, Oils & Lubricants
- Dietetic Restaurants, Oakville
- Dieticians & Diet Counseling, Oakville
- Digital Printers, Oakville
- Digital Printing & Imaging Service, Oakville
- Diner Restaurants, Oakville
- Direct Mail Advertising, Oakville
- Direct Mail Advertising Services, Oakville
- Dirt, Oakville
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- Disc Jockeys, Oakville
- Discount Stores, Oakville - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Oakville
- Dishwashers Sales, Service & Repair, Oakville
- Dispensing Machines, Oakville
- Display Fixtures & Materials, Oakville
- Displays & Display Installation Service, Oakville - Trade Show Displays
- Distribution Centers, Oakville
- Distribution Services, Oakville
- Diving Equipment & Supplies, Oakville - Scuba & Snorkel Gear & Masks Shops
- Diving Instruction, Oakville
- Divorce & Family Law Attorneys & Lawyers, Oakville
- Doctors, Physicians & Surgeons, Oakville
- Donuts, Oakville
- Door Installation & Repair, Oakville - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Oakville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Doors Glass & Mirrors, Oakville
- Drafting Services, Oakville
- Drainage Contractors, Oakville - Install & Repair Drainage Systems
- Draperies & Curtains Manufacturers, Oakville
- Dressmakers Supplies, Oakville
- Drinking Establishments, Oakville
- Driveway, Parking Lot & Blacktop Contractors, Oakville - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Oakville
- Dry Cleaning & Laundry, Oakville - Dry Cleaners
- Dryers Sales, Service & Repair, Oakville - Gas & Electric
- Drywall Contractors, Oakville - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Oakville - Installation & Repair Services
- Durable & Non Durable Goods & Products, Oakville
- Durable Goods & Products, Oakville
- Dwelling Operators Except Apartment, Oakville
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