- Laboratories Dental, Windsor
- Laboratories Medical, Windsor
- Land Surveyor, Windsor - Land Surveying Services
- Landscape Contractors & Designers, Windsor
- Landscaping, Windsor
- Landscaping Materials & Supplies, Windsor
- Late Night Restaurants, Windsor
- Laundromats & Dry-Cleaning, Coin-Operated, Windsor
- Laundry Self Service, Windsor
- Lawn & Garden Equipment & Supplies, Windsor
- Lawn & Garden Services, Windsor
- Lawn & Garden Sprinkler Systems, Windsor
- Lawn & Tree Service, Windsor
- Lawn Hydroseeding, Windsor
- Lawn Maintenance Services, Windsor
- Lawyers & Attorneys, Windsor
- Legal & Tax Services, Windsor
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- Legal Professionals, Windsor
- Letter Shop & Addressing Services, Windsor
- Libraries, Windsor
- Life Insurance, Windsor
- Limousine Service, Windsor
- Liquor Stores, Windsor
- Loading Dock Equipment, Windsor
- Loans Personal, Windsor
- Local & Short Haul Trucking Companies, Windsor
- Locks, Windsor
- Locksmiths, Windsor - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Windsor
- Lodging, Windsor
- Logistics Freight, Windsor
- Long Haul Trucking Companies, Windsor
- Lutheran Church, Windsor
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