- Dairy Products - Wholesale & Retail, Barrie
- Dams, Waterways, & Docks Contractors, Barrie
- Dance Companies, Barrie
- Dancing Instructions, Barrie
- Data Communications Service, Equipment, Supplies & Sales, Barrie
- Data Networking, Barrie
- Data Processing Security Storage, Barrie
- Data Processing Services, Barrie
- Day Spas, Barrie
- Deaf Services, Barrie
- Debt Management Assistance & Services, Barrie
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Barrie
- Decorating & Designing Services, Barrie
- Decorative Wood Products Manufacturers, Barrie
- Delicatessen Restaurants, Barrie
- Dental Clinics, Barrie
- Dental Hygienists, Barrie
- Dental Supplies & Equipment, Barrie
- Dentists, Barrie
- Denturists, Barrie
- Deodorant, Disinfectants & Germicides, Barrie
- Department Stores, Barrie
- Dermatologists, Barrie - Skin Doctors, Physicians & Surgeons (Dermatology)
- Diabetes Centers, Barrie
- Diabetes Services & Supplies, Barrie - Educational, Referral & Support Service Centers
- Dialysis Clinics, Barrie - Kidney Dialysis Centers
- Diamonds & Precious & Semi-Precious Stones, Barrie
- Diaper Service, Barrie
- Dictating Machines, Barrie
- Die Casting, Barrie
- Digital Printing & Imaging Service, Barrie
- Diner Restaurants, Barrie
- Direct Mail Advertising, Barrie
- Direct Mail Advertising Services, Barrie
- Direct Marketing, Barrie
- Direct Selling Businesses, Barrie
- Dirt, Barrie
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- Disaster Recovery, Barrie
- Disc Jockeys, Barrie
- Discount Stores, Barrie - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Barrie
- Dishwashers Sales, Service & Repair, Barrie
- Disney Store, Barrie
- Dispensing Machines, Barrie
- Display Fixtures & Materials, Barrie
- Displays & Display Installation Service, Barrie - Trade Show Displays
- Distributors, Barrie
- Diving Equipment & Supplies, Barrie - Scuba & Snorkel Gear & Masks Shops
- Diving Instruction, Barrie
- Divorce & Family Law Attorneys & Lawyers, Barrie
- Doctors, Physicians & Surgeons, Barrie
- Donuts, Barrie
- Door Installation & Repair, Barrie - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Barrie - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Doors Fire Resistant, Barrie
- Doors Folding & Pocket, Barrie
- Doors Glass & Mirrors, Barrie
- Drafting Services, Barrie
- Drainage Contractors, Barrie - Install & Repair Drainage Systems
- Drains, Pipes & Sewage Materials, Barrie
- Draperies & Curtains Manufacturers, Barrie
- Drilling & Boring Equipment & Supplies, Barrie
- Drinking Establishments, Barrie
- Driveway, Parking Lot & Blacktop Contractors, Barrie - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Barrie
- Dry Cleaning & Laundry, Barrie - Dry Cleaners
- Dryers Sales, Service & Repair, Barrie - Gas & Electric
- Drywall Contractors, Barrie - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Barrie - Installation & Repair Services
- Dunlop Tires, Barrie - Dealers
- Durable & Non Durable Goods & Products, Barrie
- Durable Goods & Products, Barrie
- Dwelling Operators Except Apartment, Barrie
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