- Landscape Contractors & Designers, Altadena
- Landscape Garden Services, Altadena
- Landscaping, Altadena
- Landscaping Materials & Supplies, Altadena
- Late Night Restaurants, Altadena
- Lawn & Garden Equipment & Supplies, Altadena
- Lawn & Garden Services, Altadena
- Lawn Maintenance Services, Altadena
- Lawyers & Attorneys, Altadena
- Legal Professionals, Altadena
- Libraries, Altadena
- Lighting Fixtures & Equipment, Altadena
- Liquid Waste Treatment, Altadena
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- Liquor Stores, Altadena
- Lithographic Printing, Altadena
- Livestock, Altadena
- Livestock Dealers, Altadena
- Loans Personal, Altadena
- Local & Short Haul Trucking Companies, Altadena
- Locks, Altadena
- Locksmiths, Altadena - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Altadena
- Lodging, Altadena
- Long Haul Trucking Companies, Altadena
- Lumber & Lumber Products, Altadena
- Lutheran Church, Altadena
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