- Labor Organizations, Dundas
- Laboratories Dental, Dundas
- Laboratories Medical, Dundas
- Land Surveyor, Dundas - Land Surveying Services
- Landscape Contractors & Designers, Dundas
- Landscaping, Dundas
- Landscaping Materials & Supplies, Dundas
- Laser Therapy Clinics, Dundas
- Laundromats & Dry-Cleaning, Coin-Operated, Dundas
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Dundas
- Lawn & Garden Equipment & Supplies, Dundas
- Lawn & Garden Services, Dundas
- Lawn & Garden Sprinkler Systems, Dundas
- Lawn Bowling, Dundas
- Lawn Maintenance Services, Dundas
- Lawyers & Attorneys, Dundas
- Legal Professionals, Dundas
- Letter Signs, Dundas
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- Libraries, Dundas
- Life Insurance, Dundas
- Lighting Consultants, Dundas
- Lighting Contractors, Dundas
- Lighting Fixtures & Equipment, Dundas
- Limousine Service, Dundas
- Liquor Stores, Dundas
- Lithographic Printing, Dundas
- Live Theaters, Dundas
- Livestock, Dundas
- Livestock Trailers, Dundas
- Local & Short Haul Trucking Companies, Dundas
- Locks, Dundas
- Locksmiths, Dundas - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Dundas
- Lodging, Dundas
- Long Haul Trucking Companies, Dundas
- Lumber & Wood Products Manufacturers, Dundas
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