- Labor Organizations, Clairton
- Laboratories Allergy, Clairton
- Laboratories Dental, Clairton
- Laboratories Medical, Clairton
- Land Surveyor, Clairton - Land Surveying Services
- Landscape Contractors & Designers, Clairton
- Landscaping, Clairton
- Landscaping Materials & Supplies, Clairton
- Lawn & Garden Equipment & Supplies, Clairton
- Lawn & Garden Services, Clairton
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- Lawn Maintenance Services, Clairton
- Lawn Mowers & Power Equipment, Clairton
- Lawyers & Attorneys, Clairton
- Legal & Tax Services, Clairton
- Legal Professionals, Clairton
- Libraries, Clairton
- Life Insurance, Clairton
- Lighting Fixtures & Equipment, Clairton
- Lodging, Clairton
- Long Haul Trucking Companies, Clairton
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