- Laboratories Dental, Millbrae
- Laboratories Medical, Millbrae
- Laboratory Equipment Repair & Service, Millbrae
- Land Surveyor, Millbrae - Land Surveying Services
- Landscape Contractors & Designers, Millbrae
- Landscape Garden Services, Millbrae
- Landscape Lighting, Millbrae
- Landscaping, Millbrae
- Laser Equipment Repair & Service, Millbrae
- Late Night Restaurants, Millbrae
- Laundromats & Dry-Cleaning, Coin-Operated, Millbrae
- Lawn & Garden Equipment & Supplies, Millbrae
- Lawn & Garden Services, Millbrae
- Lawn Maintenance Services, Millbrae
- Lawyers & Attorneys, Millbrae
- Leather Goods Cleaners & Dyers, Millbrae
- Legal & Tax Services, Millbrae
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- Legal Clinics, Millbrae
- Legal Professionals, Millbrae
- Libraries, Millbrae
- Life Insurance, Millbrae
- Lighting Fixtures & Equipment, Millbrae
- Limousine Service, Millbrae
- Liquid & Bulk Storage, Millbrae
- Liquid Transportation - Non Hazardous, Millbrae
- Liquor Stores, Millbrae
- Loans Personal, Millbrae
- Locks, Millbrae
- Locksmiths, Millbrae - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Millbrae
- Lodging, Millbrae
- Lodging Services, Millbrae
- Long Haul Trucking Companies, Millbrae
- Lutheran Church, Millbrae
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