- Labor Organizations, South Windsor
- Laboratories Dental, South Windsor
- Laboratories Medical, South Windsor
- Land Surveyor, South Windsor - Land Surveying Services
- Landscape Contractors & Designers, South Windsor
- Landscaping, South Windsor
- Landscaping Materials & Supplies, South Windsor
- Lawn & Garden Equipment & Supplies, South Windsor
- Lawn & Garden Services, South Windsor
- Lawn & Garden Sprinkler Systems, South Windsor
- Lawn Maintenance Services, South Windsor
- Lawn Mower Repair & Blade Sharpening Service, South Windsor
- Lawn Mowers & Power Equipment, South Windsor
- Lawn Spraying & Treatment, South Windsor
- Lawyers & Attorneys, South Windsor
- Leather Goods Cleaners & Dyers, South Windsor
- Legal Professionals, South Windsor
- Libraries, South Windsor
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- Life Insurance, South Windsor
- Lighting Consultants, South Windsor
- Lighting Contractors, South Windsor
- Lighting Fixtures & Equipment, South Windsor
- Limousine Service, South Windsor
- Linen Supply Services, South Windsor
- Liquor Stores, South Windsor
- Litigation / Trial Attorneys & Lawyers, South Windsor
- Living Room Furniture, South Windsor
- Loans Personal, South Windsor
- Local & Short Haul Trucking Companies, South Windsor
- Locks, South Windsor
- Locksmiths, South Windsor - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, South Windsor
- Long Haul Trucking Companies, South Windsor
- Lp Gas Equipment & Supplies, South Windsor
- Lumber Companies, South Windsor - Wholesale, Manufacturers & Suppliers
- Lutheran Church, South Windsor
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