- Laboratories Medical, Wantagh
- Ladder & Lift Equipment & Machine Rental, Wantagh
- Land Surveyor, Wantagh - Land Surveying Services
- Landscape Contractors & Designers, Wantagh
- Landscaping, Wantagh
- Laundry Self Service, Wantagh
- Lawn & Garden Equipment & Supplies, Wantagh
- Lawn & Garden Services, Wantagh
- Lawn & Garden Sprinkler Systems, Wantagh
- Lawn Maintenance Services, Wantagh
- Lawyers & Attorneys, Wantagh
- Legal & Tax Services, Wantagh
- Legal Professionals, Wantagh
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- Libraries, Wantagh
- Life Insurance, Wantagh
- Limousine Service, Wantagh
- Liquor Stores, Wantagh
- Live Theaters, Wantagh
- Loans Personal, Wantagh
- Locks, Wantagh
- Locksmiths, Wantagh - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Wantagh
- Lodging, Wantagh
- Luggage & Accessories , Wantagh
- Lumber Companies, Wantagh - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Wantagh
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