- Labor Organizations, Leechburg
- Laboratories Medical, Leechburg
- Landscape Contractors & Designers, Leechburg
- Landscaping, Leechburg
- Landscaping Materials & Supplies, Leechburg
- Lawn & Garden Equipment & Supplies, Leechburg
- Lawn & Garden Services, Leechburg
- Lawn Maintenance Services, Leechburg
- Lawn Mowers & Power Equipment, Leechburg
- Lawyers & Attorneys, Leechburg
- Legal & Tax Services, Leechburg
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- Legal Professionals, Leechburg
- Libraries, Leechburg
- Life Insurance, Leechburg
- Limousine Service, Leechburg
- Liquor & Beer Manufacturers, Leechburg
- Liquor Stores, Leechburg
- Loans Personal, Leechburg
- Lodging, Leechburg
- Long Haul Trucking Companies, Leechburg
- Lubricating Oils , Leechburg - Motor Oil
- Lutheran Church, Leechburg
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