- Land Use & Zoning Attorneys & Lawyers, Mattituck
- Landscape Contractors & Designers, Mattituck
- Landscaping, Mattituck
- Landscaping Materials & Supplies, Mattituck
- Laundry Self Service, Mattituck
- Lawn & Garden Equipment & Supplies, Mattituck
- Lawn & Garden Services, Mattituck
- Lawn & Garden Sprinkler Systems, Mattituck
- Lawn Maintenance Services, Mattituck
- Lawn Mower Repair & Blade Sharpening Service, Mattituck
- Lawn Mowers & Power Equipment, Mattituck
- Lawn Spraying & Treatment, Mattituck
- Lawyers & Attorneys, Mattituck
- Legal Professionals, Mattituck
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- Libraries, Mattituck
- Lighting Fixtures & Equipment, Mattituck
- Liquor Stores, Mattituck
- Live Theaters, Mattituck
- Loans Personal, Mattituck
- Locks, Mattituck
- Locksmiths, Mattituck - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Mattituck
- Lodging, Mattituck
- Long Haul Trucking Companies, Mattituck
- Lumber & Lumber Products, Mattituck
- Lumber & Lumber Products, Mattituck
- Lutheran Church, Mattituck
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