- Dairy Products - Wholesale & Retail, Tillsonburg
- Dance Companies, Tillsonburg
- Data Processing Services, Tillsonburg
- Day Spas, Tillsonburg
- Decorating & Designing Services, Tillsonburg
- Dehumidifying & Ventilating Equipment, Tillsonburg - Suppliers & Wholesalers
- Delicatessen Restaurants, Tillsonburg
- Dentists, Tillsonburg
- Denturists, Tillsonburg
- Department Stores, Tillsonburg
- Digital Printing & Imaging Service, Tillsonburg
- Direct Mail Advertising Services, Tillsonburg
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- Discount Stores, Tillsonburg - Clothing, Grocery, Furniture, Etc
- Doctors, Physicians & Surgeons, Tillsonburg
- Donuts, Tillsonburg
- Door Glass & Mirrors, Tillsonburg
- Door Installation & Repair, Tillsonburg - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Drainage Contractors, Tillsonburg - Install & Repair Drainage Systems
- Dressmakers Supplies, Tillsonburg
- Drinking Establishments, Tillsonburg
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Tillsonburg
- Dry Cleaning & Laundry, Tillsonburg - Dry Cleaners
- Drywall Contractors, Tillsonburg - Drywall Repair & Installation Services
- Durable & Non Durable Goods & Products, Tillsonburg
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