- Labor Organizations, Mamaroneck
- Laboratories Dental, Mamaroneck
- Laboratories Medical, Mamaroneck
- Land Surveyor, Mamaroneck - Land Surveying Services
- Landscape Contractors & Designers, Mamaroneck
- Landscape Lighting, Mamaroneck
- Landscaping, Mamaroneck
- Late Night Restaurants, Mamaroneck
- Laundry Self Service, Mamaroneck
- Lawn & Garden Equipment & Supplies, Mamaroneck
- Lawn Mowers & Power Equipment, Mamaroneck
- Lawyers & Attorneys, Mamaroneck
- Legal & Tax Services, Mamaroneck
- Legal Professionals, Mamaroneck
- Libraries, Mamaroneck
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- Life Insurance, Mamaroneck
- Lighting Fixtures & Equipment, Mamaroneck
- Limousine Service, Mamaroneck
- Liquor Stores, Mamaroneck
- Live Theaters, Mamaroneck
- Loans Personal, Mamaroneck
- Locks, Mamaroneck
- Locksmiths, Mamaroneck - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Mamaroneck
- Lodging, Mamaroneck
- Long Haul Trucking Companies, Mamaroneck
- Lumber & Lumber Products, Mamaroneck
- Lumber & Lumber Products, Mamaroneck
- Lumber Commission, Mamaroneck
- Lutheran Church, Mamaroneck
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