- Labor & Employment Consultants, La Jolla
- Labor Organizations, La Jolla
- Laboratories Medical, La Jolla
- Laboratories Pharmaceutical, La Jolla
- Land Companies, La Jolla
- Land Surveyor, La Jolla - Land Surveying Services
- Landscape Contractors & Designers, La Jolla
- Landscaping, La Jolla
- Late Night Restaurants, La Jolla
- Lawn & Garden Services, La Jolla
- Lawn Maintenance Services, La Jolla
- Lawyers & Attorneys, La Jolla
- Lead Inspection, Testing & Consulting, La Jolla - Lead Paint
- Legal & Tax Services, La Jolla
- Legal Professionals, La Jolla
- Libraries, La Jolla
- Life Insurance, La Jolla
- Lighting Fixtures & Equipment, La Jolla
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- Lighting Maintenance, La Jolla
- Limousine Service, La Jolla
- Linens, La Jolla
- Linens & Towels Manufacturers, La Jolla
- Liquor Stores, La Jolla
- Live Theaters, La Jolla
- Livestock, La Jolla
- Livestock Dealers, La Jolla
- Loans Personal, La Jolla
- Locks, La Jolla
- Locksmiths, La Jolla - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, La Jolla
- Lodging, La Jolla
- Lodging Services, La Jolla
- Long Haul Trucking Companies, La Jolla
- Lumber & Lumber Products, La Jolla
- Lumber & Lumber Products, La Jolla
- Lutheran Church, La Jolla
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