- Laboratories Dental, New Fairfield
- Laboratories Medical, New Fairfield
- Land Surveyor, New Fairfield - Land Surveying Services
- Landscape Contractors & Designers, New Fairfield
- Landscaping, New Fairfield
- Lawn & Garden Equipment & Supplies, New Fairfield
- Lawn & Garden Services, New Fairfield
- Lawn Maintenance Services, New Fairfield
- Lawn Mowers & Power Equipment, New Fairfield
- Lawyers & Attorneys, New Fairfield
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- Legal Professionals, New Fairfield
- Legislative Analysts & Consultants, New Fairfield
- Limousine Service, New Fairfield
- Liquor Stores, New Fairfield
- Lodging, New Fairfield
- Lumber & Lumber Products, New Fairfield
- Lumber & Lumber Products, New Fairfield
- Lumber Companies, New Fairfield - Wholesale, Manufacturers & Suppliers
- Luncheonette Restaurants, New Fairfield
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