- Labor & Employment Consultants, Windsor
- Labor Organizations, Windsor
- Laboratories Medical, Windsor
- Laminated Structural Products, Windsor
- Landscape Contractors & Designers, Windsor
- Landscaping, Windsor
- Landscaping Materials & Supplies, Windsor
- Latin American Restaurants, Windsor
- Lawn & Garden Equipment & Supplies, Windsor
- Lawyers & Attorneys, Windsor
- Legal & Tax Services, Windsor
- Legal Professionals, Windsor
- Libraries, Windsor
- Life Insurance, Windsor
- Limousine Service, Windsor
- Lions Clubs, Windsor
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- Liquid & Bulk Storage, Windsor
- Liquid Transportation - Non Hazardous, Windsor
- Liquor Stores, Windsor
- Loans Check Cashing, Windsor
- Loans Personal, Windsor
- Loans Title Services, Windsor
- Locks, Windsor
- Locksmiths, Windsor - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Windsor
- Lodging, Windsor
- Lodging Services, Windsor
- Long Haul Trucking Companies, Windsor
- Lumber & Lumber Products, Windsor
- Lumber & Wood Products Manufacturers, Windsor
- Lumber Companies, Windsor - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Windsor
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