- Labor Organizations, Darien
- Laboratories Medical, Darien
- Landscape Contractors & Designers, Darien
- Landscaping, Darien
- Landscaping Materials & Supplies, Darien
- Lawn & Garden Services, Darien
- Lawn Maintenance Services, Darien
- Lawyers & Attorneys, Darien
- Legal & Tax Services, Darien
- Legal Information & Referral Services, Darien
- Legal Professionals, Darien
- Libraries, Darien
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- Life Insurance, Darien
- Limousine Service, Darien
- Linens Hotel Institutional Etcetera Manufacturers, Darien
- Liquor Stores, Darien
- Loans Personal, Darien
- Locks, Darien
- Locksmiths, Darien - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Darien
- Lodging, Darien
- Long Haul Trucking Companies, Darien
- Lutheran Church, Darien
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