- Ladder & Ladder Accessories, Kelseyville
- Land Surveyor, Kelseyville - Land Surveying Services
- Lawn & Garden Services, Kelseyville
- Lawn Maintenance Services, Kelseyville
- Lawyers & Attorneys, Kelseyville
- Legal & Tax Services, Kelseyville
- Legal Professionals, Kelseyville
- Life Insurance, Kelseyville
- Lighting Consultants, Kelseyville
- Lighting Contractors, Kelseyville
- Limousine Service, Kelseyville
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- Lions Clubs, Kelseyville
- Liquor Stores, Kelseyville
- Loans Personal, Kelseyville
- Lodging, Kelseyville
- Long Haul Trucking Companies, Kelseyville
- Lumber & Lumber Products, Kelseyville
- Lumber & Lumber Products, Kelseyville
- Lumber & Wood Products Manufacturers, Kelseyville
- Lumber Companies, Kelseyville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Kelseyville
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