- Dairy Farms, Beamsville
- Dance Companies, Beamsville
- Day Spas, Beamsville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Beamsville
- Decorating & Designing Services, Beamsville
- Dental Hygienists, Beamsville
- Dentists, Beamsville
- Denturists, Beamsville
- Department Stores, Beamsville
- Diabetes Centers, Beamsville
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- Direct Mail Advertising Services, Beamsville
- Dock Construction - Build & Repair, Beamsville - Dock Builders
- Doctors, Physicians & Surgeons, Beamsville
- Donuts, Beamsville
- Doors & Door Frames, Beamsville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, Beamsville
- Driveway, Parking Lot & Blacktop Contractors, Beamsville - Construction, Repair & Maintenance
- Dry Cleaning & Laundry, Beamsville - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Beamsville - Installation & Repair Services
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