- Labor & Employment Consultants, Melville
- Labor And Employment Relations Attorneys & Lawyers, Melville
- Labor And Employment Relations Lawyers & Attorneys, Melville
- Labor Organizations, Melville
- Laboratories Medical, Melville
- Land Surveyor, Melville - Land Surveying Services
- Landscape Contractors & Designers, Melville
- Landscape Lighting, Melville
- Landscaping, Melville
- Landscaping Materials & Supplies, Melville
- Laundromats & Dry-Cleaning, Coin-Operated, Melville
- Lawn & Garden Equipment & Supplies, Melville
- Lawn & Garden Sprinkler Systems, Melville
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- Lawyers & Attorneys, Melville
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- Legal Information & Referral Services, Melville
- Legal Professionals, Melville
- Libraries, Melville
- Life Insurance, Melville
- Lighting Fixtures & Equipment, Melville
- Limousine Service, Melville
- Liquor Stores, Melville
- Loans Personal, Melville
- Lodging, Melville
- Luncheonette Restaurants, Melville
- Lutheran Church, Melville
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