- Labor & Employment Consultants, Port Jefferson
- Land Use & Zoning Attorneys & Lawyers, Port Jefferson
- Landscape Contractors & Designers, Port Jefferson
- Landscaping, Port Jefferson
- Landscaping Materials & Supplies, Port Jefferson
- Laser Hair Removal, Port Jefferson
- Laundry Self Service, Port Jefferson
- Lawn & Garden Equipment & Supplies, Port Jefferson
- Lawn & Garden Services, Port Jefferson
- Lawn & Garden Sprinkler Systems, Port Jefferson
- Lawn Maintenance Services, Port Jefferson
- Lawyers & Attorneys, Port Jefferson
- Legal & Tax Services, Port Jefferson
- Legal Professionals, Port Jefferson
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- Libraries, Port Jefferson
- License Bureaus Motor Vehicles, Port Jefferson
- Life Insurance, Port Jefferson
- Lighting Fixtures & Equipment, Port Jefferson
- Limousine Service, Port Jefferson
- Liquor & Beer Manufacturers, Port Jefferson
- Liquor Stores, Port Jefferson
- Live Theaters, Port Jefferson
- Loans Personal, Port Jefferson
- Locks, Port Jefferson
- Locksmiths, Port Jefferson - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Port Jefferson
- Lodging, Port Jefferson
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