- Labels & Tags, Port Washington
- Labor & Employment Consultants, Port Washington
- Laboratories Dental, Port Washington
- Laboratories Medical, Port Washington
- Landscape Contractors & Designers, Port Washington
- Landscape Garden Services, Port Washington
- Landscape Lighting, Port Washington
- Landscaping, Port Washington
- Landscaping Materials & Supplies, Port Washington
- Language Schools, Port Washington
- Late Night Restaurants, Port Washington
- Laundry & Dry Cleaning Equipment & Supplies, Port Washington - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, Port Washington
- Lawn & Garden Equipment & Supplies, Port Washington
- Lawn & Garden Services, Port Washington
- Lawn & Garden Sprinkler Systems, Port Washington
- Lawn Maintenance Services, Port Washington
- Lawn Mowers & Power Equipment, Port Washington
- Lawn Spraying & Treatment, Port Washington
- Lawyers & Attorneys, Port Washington
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- Legal & Tax Services, Port Washington
- Legal Information & Referral Services, Port Washington
- Legal Professionals, Port Washington
- Libraries, Port Washington
- Lighting Fixtures & Equipment, Port Washington
- Lighting Fixtures Repair, Maintenance & Installation, Port Washington
- Limousine Service, Port Washington
- Liquid & Bulk Storage, Port Washington
- Liquid Filters, Port Washington
- Liquor Stores, Port Washington
- Litigation / Trial Attorneys & Lawyers, Port Washington
- Loans Personal, Port Washington
- Locks, Port Washington
- Locksmiths, Port Washington - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Port Washington
- Lodging, Port Washington
- Lodging Services, Port Washington
- Long Haul Trucking Companies, Port Washington
- Lutheran Church, Port Washington
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