- Dance Companies, Brockville
- Day Spas, Brockville
- Deaf Services, Brockville
- Debt Management Assistance & Services, Brockville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Brockville
- Decorating & Designing Services, Brockville
- Delicatessen Restaurants, Brockville
- Dental Clinics, Brockville
- Dental Hygienists, Brockville
- Dentists, Brockville
- Denturists, Brockville
- Department Stores, Brockville
- Diamonds & Precious & Semi-Precious Stones, Brockville
- Dimension Stone Products, Brockville
- Diner Restaurants, Brockville
- Direct Mail Advertising Services, Brockville
- Direct Selling Businesses, Brockville
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- Discount Stores, Brockville - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Brockville
- Distribution Centers, Brockville
- Distribution Services, Brockville
- Divers & Diving Professionals, Brockville
- Dock Construction - Build & Repair, Brockville - Dock Builders
- Doctors, Physicians & Surgeons, Brockville
- Donuts, Brockville
- Drafting Services, Brockville
- Drinking Establishments, Brockville
- Driveway, Parking Lot & Blacktop Contractors, Brockville - Construction, Repair & Maintenance
- Dry Cleaning & Laundry, Brockville - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Brockville - Installation & Repair Services
- Dunlop Tires, Brockville - Dealers
- Durable & Non Durable Goods & Products, Brockville
- Durable Goods & Products, Brockville
- Dyes & Dye Stuff, Brockville
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