- Laboratories Dental, Waterdown
- Laboratories Medical, Waterdown
- Landscape Contractors & Designers, Waterdown
- Landscape Lighting, Waterdown
- Landscaping, Waterdown
- Landscaping Materials & Supplies, Waterdown
- Laundry & Dry Cleaning Equipment & Supplies, Waterdown - Cleaners & Dryers Sales, Repair, Service & Leasing
- Lawn & Garden Equipment & Supplies, Waterdown
- Lawn & Garden Services, Waterdown
- Lawn & Garden Sprinkler Systems, Waterdown
- Lawn & Yard, Waterdown
- Lawn Maintenance Services, Waterdown
- Lawyers & Attorneys, Waterdown
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- Legal & Tax Services, Waterdown
- Legal Professionals, Waterdown
- Lennox Air Conditioning, Waterdown - Air Conditioner Contractors & Systems
- Libraries, Waterdown
- Life Insurance, Waterdown
- Limousine Service, Waterdown
- Liquor Stores, Waterdown
- Live Theaters, Waterdown
- Local & Short Haul Trucking Companies, Waterdown
- Locks, Waterdown
- Locksmiths, Waterdown - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Waterdown
- Long Haul Trucking Companies, Waterdown
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