- Labor Organizations, Thorold
- Laboratories Medical, Thorold
- Landscape Contractors & Designers, Thorold
- Landscaping, Thorold
- Lawyers & Attorneys, Thorold
- Legal & Tax Services, Thorold
- Legal Professionals, Thorold
- Libraries, Thorold
- Life Insurance, Thorold
- Lift Trucks, Thorold
- Lighting Fixtures Repair, Maintenance & Installation, Thorold
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- Limousine Service, Thorold
- Liquor Stores, Thorold
- Live Theaters, Thorold
- Locks, Thorold
- Locksmiths, Thorold - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Thorold
- Lodging, Thorold
- Long Haul Trucking Companies, Thorold
- Lumber & Lumber Products, Thorold
- Lumber & Lumber Products, Thorold
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