- Laboratories Dental, Copiague
- Laboratories Medical, Copiague
- Landscape Contractors & Designers, Copiague
- Landscaping, Copiague
- Landscaping Materials & Supplies, Copiague
- Laundry Self Service, Copiague
- Lawn & Garden Services, Copiague
- Lawn Maintenance Services, Copiague
- Lawyers & Attorneys, Copiague
- Legal Professionals, Copiague
- Libraries, Copiague
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- License Services, Copiague
- Lighting Fixtures & Equipment, Copiague
- Limousine Service, Copiague
- Linen Supply Services, Copiague
- Liquor Stores, Copiague
- Loans Personal, Copiague
- Lodging, Copiague
- Long Haul Trucking Companies, Copiague
- Lumber & Lumber Products, Copiague
- Lumber & Lumber Products, Copiague
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