- Labor Organizations, Weirton
- Land Surveyor, Weirton - Land Surveying Services
- Landscaping Materials & Supplies, Weirton
- Late Night Restaurants, Weirton
- Laundry Self Service, Weirton
- Lawn & Garden Equipment & Supplies, Weirton
- Lawn & Garden Services, Weirton
- Lawn Maintenance Services, Weirton
- Lawn Mowers & Power Equipment, Weirton
- Lawyers & Attorneys, Weirton
- Legal Professionals, Weirton
- Libraries, Weirton
- License Bureaus Motor Vehicles, Weirton
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- Liquid & Bulk Storage, Weirton
- Liquor Stores, Weirton
- Lithographic Printing, Weirton
- Lithography Equipment & Supplies, Weirton
- Loans Personal, Weirton
- Lodging, Weirton
- Lodging Services, Weirton
- Long Haul Trucking Companies, Weirton
- Long Term Care Facility, Weirton
- Lumber & Lumber Products, Weirton
- Lumber & Lumber Products, Weirton
- Lutheran Church, Weirton
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