- Landscape Contractors & Designers, Darien
- Landscaping, Darien
- Lawn & Garden Services, Darien
- Lawn Maintenance Services, Darien
- Lawn Mower Repair & Blade Sharpening Service, Darien
- Lawyers & Attorneys, Darien
- Leather Goods Trimmings, Darien
- Legal Professionals, Darien
- Libraries, Darien
- Life Insurance, Darien
- Liquor Stores, Darien
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- Loans Personal, Darien
- Local & Short Haul Trucking Companies, Darien
- Locks, Darien
- Locksmiths, Darien - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Darien
- Lodging, Darien
- Lodging Services, Darien
- Long Haul Trucking Companies, Darien
- Lumber & Lumber Products, Darien
- Lumber & Lumber Products, Darien
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