- Dairy Products - Wholesale & Retail, Ontario
- Decals, Ontario
- Decorating & Designing Services, Ontario
- Delicatessen Restaurants, Ontario
- Dental Bonding & Cosmetic Dentistry, Ontario - Cosmetic Dentist & Tooth Bonding
- Dental Supplies & Equipment, Ontario
- Dentists, Ontario
- Dentures, Ontario
- Denturists, Ontario
- Department Stores, Ontario
- Dermatologists, Ontario - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Children Services, Ontario
- Developmental Disabilities, Ontario
- Developmentally Disabled Information & Services, Ontario
- Diabetic Equipment & Supplies, Ontario
- Dialysis Clinics, Ontario - Kidney Dialysis Centers
- Diesel Engine, Ontario
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- Diesel Engine Repair & Service, Ontario
- Digital Printing & Imaging Service, Ontario
- Direct Mail Advertising Services, Ontario
- Disabled Persons Assistive Services, Ontario
- Disciples Of Christ Church, Ontario
- Discount Stores, Ontario - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Ontario
- Doctorate Degree, Ontario
- Doctors, Physicians & Surgeons, Ontario
- Dog & Cat Foods, Ontario
- Dressmaking & Sewing Schools, Ontario
- Drinking Establishments, Ontario
- Drive In Restaurants, Ontario
- Drive Shafts, Ontario
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Ontario
- Dry Cleaning & Laundry, Ontario - Dry Cleaners
- Durable & Non Durable Goods & Products, Ontario
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