- Labor & Employment Consultants, Cos Cob
- Land Surveyor, Cos Cob - Land Surveying Services
- Landscape Contractors & Designers, Cos Cob
- Landscaping, Cos Cob
- Late Night Restaurants, Cos Cob
- Lawn & Garden Services, Cos Cob
- Lawn Maintenance Services, Cos Cob
- Lawyers & Attorneys, Cos Cob
- Legal Professionals, Cos Cob
- Libraries, Cos Cob
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- Lighting Consultants, Cos Cob
- Lighting Consultants & Designers, Cos Cob
- Lighting Contractors, Cos Cob
- Lighting Fixtures & Equipment, Cos Cob
- Limousine Service, Cos Cob
- Liquor Stores, Cos Cob
- Locks, Cos Cob
- Locksmiths, Cos Cob - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Cos Cob
- Lodging, Cos Cob
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