- Laboratories Dental, Jamestown
- Laboratories Medical, Jamestown
- Land Surveyor, Jamestown - Land Surveying Services
- Landscape Contractors & Designers, Jamestown
- Landscape Lighting, Jamestown
- Landscaping, Jamestown
- Landscaping Materials & Supplies, Jamestown
- Late Night Restaurants, Jamestown
- Laundry & Dry Cleaning Equipment & Supplies, Jamestown - Cleaners & Dryers Sales, Repair, Service & Leasing
- Lawn & Garden Equipment & Supplies, Jamestown
- Lawn & Garden Services, Jamestown
- Lawn & Garden Sprinkler Systems, Jamestown
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- Lawn Maintenance Services, Jamestown
- Lawn Mower Repair & Blade Sharpening Service, Jamestown
- Lawn Mowers & Power Equipment, Jamestown
- Lawyers & Attorneys, Jamestown
- Legal Professionals, Jamestown
- Libraries, Jamestown
- Local & Short Haul Trucking Companies, Jamestown
- Long Haul Trucking Companies, Jamestown
- Lumber & Lumber Products, Jamestown
- Lumber & Wood Products Manufacturers, Jamestown
- Lumber Companies, Jamestown - Wholesale, Manufacturers & Suppliers
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