- Labor Organizations, Clarksville
- Laboratories Medical, Clarksville
- Land Companies, Clarksville
- Land Surveyor, Clarksville - Land Surveying Services
- Lawn & Garden Equipment & Supplies, Clarksville
- Lawn Mower Repair & Blade Sharpening Service, Clarksville
- Lawn Mowers & Power Equipment, Clarksville
- Lawyers & Attorneys, Clarksville
- Legal & Tax Services, Clarksville
- Legal Professionals, Clarksville
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- Life Insurance, Clarksville
- Livestock, Clarksville
- Livestock Equipment & Supplies, Clarksville
- Loans Personal, Clarksville
- Lodging, Clarksville
- Lodging Services, Clarksville
- Long Haul Trucking Companies, Clarksville
- Lubricating Oils , Clarksville - Motor Oil
- Lumber & Lumber Products, Clarksville
- Lumber & Lumber Products, Clarksville
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