- Laboratories Dental, El Sobrante
- Laboratories Medical, El Sobrante
- Land Surveyor, El Sobrante - Land Surveying Services
- Landscape Contractors & Designers, El Sobrante
- Landscape Garden Services, El Sobrante
- Landscaping, El Sobrante
- Late Night Restaurants, El Sobrante
- Laundromats & Dry-Cleaning, Coin-Operated, El Sobrante
- Lawn & Garden Services, El Sobrante
- Lawyers & Attorneys, El Sobrante
- Leather Goods & Luggage Repair, El Sobrante
- Legal Professionals, El Sobrante
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- Libraries, El Sobrante
- Life Insurance, El Sobrante
- Life Rafts, Inflatable Boats & Accessories, El Sobrante - Life Jackets, etc
- Limousine Service, El Sobrante
- Liquor Stores, El Sobrante
- Loans Personal, El Sobrante
- Locks, El Sobrante
- Locksmiths, El Sobrante - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, El Sobrante
- Lodging, El Sobrante
- Long Haul Trucking Companies, El Sobrante
- Lumber & Lumber Products, El Sobrante
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