- Land Surveyor, Los Alamos - Land Surveying Services
- Landscape Contractors & Designers, Los Alamos
- Landscaping, Los Alamos
- Landscaping Materials & Supplies, Los Alamos
- Laser Printers, Los Alamos - Office Supplies
- Lawn & Garden Equipment & Supplies, Los Alamos
- Lawn & Garden Services, Los Alamos
- Lawn & Garden Sprinkler Systems, Los Alamos
- Lawn Mowers & Power Equipment, Los Alamos
- Lawyers & Attorneys, Los Alamos
- Legal Professionals, Los Alamos
- Libraries, Los Alamos
- Life Insurance, Los Alamos
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- Liquor & Beer Manufacturers, Los Alamos
- Live Theaters, Los Alamos
- Livestock, Los Alamos
- Loans Personal, Los Alamos
- Local & Short Haul Trucking Companies, Los Alamos
- Locks, Los Alamos
- Locksmiths, Los Alamos - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Los Alamos
- Lodging, Los Alamos
- Lodging Services, Los Alamos
- Long Haul Trucking Companies, Los Alamos
- Lutheran Church, Los Alamos
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