- Labor & Employment Consultants, Stouffville
- Labor Relations Counselors, Stouffville
- Laboratories Dental, Stouffville
- Laboratories Medical, Stouffville
- Landscape Contractors & Designers, Stouffville
- Landscape Lighting, Stouffville
- Landscaping, Stouffville
- Landscaping Materials & Supplies, Stouffville
- Lawn & Garden Equipment & Supplies, Stouffville
- Lawn & Garden Services, Stouffville
- Lawn & Garden Sprinkler Systems, Stouffville
- Lawn Maintenance Services, Stouffville
- Lawn Mowers & Power Equipment, Stouffville
- Lawyers & Attorneys, Stouffville
- Legal & Tax Services, Stouffville
- Legal Professionals, Stouffville
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- Libraries, Stouffville
- License & Registry Services, Stouffville
- Life Insurance, Stouffville
- Lighting Fixtures & Equipment, Stouffville
- Liquor Stores, Stouffville
- Lithographic Printing, Stouffville
- Livestock, Stouffville
- Local & Short Haul Trucking Companies, Stouffville
- Locks, Stouffville
- Locksmiths, Stouffville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Stouffville
- Lodging, Stouffville
- Long Haul Trucking Companies, Stouffville
- Lumber & Lumber Products, Stouffville
- Lumber & Lumber Products, Stouffville
- Lumber Companies, Stouffville - Wholesale, Manufacturers & Suppliers
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