- Dairy Products - Manufacturers, Simcoe
- Dairy Products - Wholesale & Retail, Simcoe
- Dance Companies, Simcoe
- Data Processing Services, Simcoe
- Day Spas, Simcoe
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Simcoe
- Decorating & Designing Services, Simcoe
- Delicatessen Products Manufacturers, Simcoe
- Delicatessen Restaurants, Simcoe
- Dental Laboratories, Simcoe
- Dentists, Simcoe
- Denturists, Simcoe
- Department Stores, Simcoe
- Developmental Disabilities, Simcoe
- Developmentally Disabled Information & Services, Simcoe
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- Direct Mail Advertising Services, Simcoe
- Dirt, Simcoe
- Disc Jockeys, Simcoe
- Discount Stores, Simcoe - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Simcoe
- Dispensing Machines, Simcoe
- Doctors, Physicians & Surgeons, Simcoe
- Drinking Establishments, Simcoe
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Simcoe
- Dry Cleaning & Laundry, Simcoe - Dry Cleaners
- Drywall Contractors, Simcoe - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Simcoe - Installation & Repair Services
- Durable & Non Durable Goods & Products, Simcoe
- Durable Goods & Products, Simcoe
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