- Labor & Employment Consultants, Deer Park
- Labor Organizations, Deer Park
- Laboratories Medical, Deer Park
- Ladder & Lift Equipment & Machine Rental, Deer Park
- Land Surveyor, Deer Park - Land Surveying Services
- Landscape Contractors & Designers, Deer Park
- Landscaping, Deer Park
- Late Night Restaurants, Deer Park
- Laundromats & Dry-Cleaning, Coin-Operated, Deer Park
- Lawn & Garden Equipment & Supplies, Deer Park
- Lawn & Garden Services, Deer Park
- Lawn Maintenance Services, Deer Park
- Lawn Mower Repair & Blade Sharpening Service, Deer Park
- Lawn Mowers & Power Equipment, Deer Park
- Lawyers & Attorneys, Deer Park
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- Lead Testing, Detection & Removal - Commercial & Industrial, Deer Park - Lead Paint
- Lead Testing, Detection & Removal - Residential, Deer Park - Lead Paint
- Legal & Tax Services, Deer Park
- Legal Professionals, Deer Park
- Life Insurance, Deer Park
- Liquor Stores, Deer Park
- Loans Personal, Deer Park
- Locks, Deer Park
- Locksmiths, Deer Park - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Deer Park
- Lodging, Deer Park
- Lodging Services, Deer Park
- Logistics Freight, Deer Park
- Long Haul Trucking Companies, Deer Park
- Lp Gas Equipment & Supplies, Deer Park
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