- Laboratories Dental, Wylie
- Laboratories Medical, Wylie
- Landscape Contractors & Designers, Wylie
- Landscaping, Wylie
- Late Night Restaurants, Wylie
- Lawn & Garden Equipment & Supplies, Wylie
- Lawn & Garden Services, Wylie
- Lawn & Garden Sprinkler Systems, Wylie
- Lawn Maintenance Services, Wylie
- Lawyers & Attorneys, Wylie
- Lead Testing, Detection & Removal - Commercial & Industrial, Wylie - Lead Paint
- Lead Testing, Detection & Removal - Residential, Wylie - Lead Paint
- Legal & Tax Services, Wylie
- Legal Professionals, Wylie
- Libraries, Wylie
- Life Insurance, Wylie
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- Lighting Fixtures & Equipment, Wylie
- Liquid Waste Treatment, Wylie
- Live Theaters, Wylie
- Livestock, Wylie
- Loans Check Cashing, Wylie
- Loans Personal, Wylie
- Local & Short Haul Trucking Companies, Wylie
- Locksmiths, Wylie - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Wylie
- Logistics Freight, Wylie
- Long Haul Trucking Companies, Wylie
- Lp Gas Equipment & Supplies, Wylie
- Lumber & Lumber Products, Wylie
- Lumber & Lumber Products, Wylie
- Lutheran Church, Wylie
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