- Laboratories Dental, Jamestown
- Laboratories Medical, Jamestown
- Land Surveyor, Jamestown - Land Surveying Services
- Landscape Contractors & Designers, Jamestown
- Landscaping, Jamestown
- Landscaping Materials & Supplies, Jamestown
- Late Night Restaurants, Jamestown
- Laundry Self Service, Jamestown
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Jamestown
- Lawn & Garden Equipment & Supplies, Jamestown
- Lawn & Garden Services, Jamestown
- Lawn & Garden Sprinkler Systems, Jamestown
- Lawn Maintenance Services, Jamestown
- Lawn Mower Repair & Blade Sharpening Service, Jamestown
- Lawn Mowers & Power Equipment, Jamestown
- Lawyers & Attorneys, Jamestown
- Leather Goods Stores & Dealers, Jamestown
- Legal & Tax Services, Jamestown
- Legal Professionals, Jamestown
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- Libraries, Jamestown
- License Services, Jamestown
- Life Insurance, Jamestown
- Liquor Stores, Jamestown
- Livestock, Jamestown
- Livestock Auctions, Jamestown
- Livestock Auctions, Jamestown
- Livestock Dealers, Jamestown
- Livestock Trailers, Jamestown
- Loans Personal, Jamestown
- Lodging, Jamestown
- Lodging Services, Jamestown
- Log Homes - Log Cabins Builders, Jamestown - Building Contractors
- Logs For Homes & Siding, Jamestown
- Long Haul Trucking Companies, Jamestown
- Lumber & Lumber Products, Jamestown
- Lumber & Lumber Products, Jamestown
- Lutheran Church, Jamestown
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