- Labels & Tags, South San Francisco
- Laboratories Biochemical, South San Francisco
- Laboratories Biological, South San Francisco
- Laboratories Dental, South San Francisco
- Laboratories Medical, South San Francisco
- Laboratories Pharmaceutical, South San Francisco
- Ladder & Lift Equipment & Machine Rental, South San Francisco
- Ladders Wholesale, South San Francisco
- Landlord - Tenant Attorneys & Lawyers, South San Francisco
- Landlord - Tenant Lawyers & Attorneys, South San Francisco
- Landlord And Tenant Attorneys & Lawyers, South San Francisco
- Landscape Contractors & Designers, South San Francisco
- Landscape Garden Services, South San Francisco
- Landscaping, South San Francisco
- Landscaping Materials & Supplies, South San Francisco
- Laser Printers, South San Francisco - Office Supplies
- Late Night Restaurants, South San Francisco
- Laundromats & Dry-Cleaning, Coin-Operated, South San Francisco
- Laundry & Dry Cleaning Equipment & Supplies, South San Francisco - Cleaners & Dryers Sales, Repair, Service & Leasing
- Lawn & Garden Services, South San Francisco
- Lawn Furnishings, South San Francisco
- Lawn Maintenance Services, South San Francisco
- Lawyers & Attorneys, South San Francisco
- Leather Apparel Goods Manufacturers, South San Francisco
- Leather Goods, South San Francisco
- Leather Tanning & Finishing Manufacturers, South San Francisco
- Legal & Tax Services, South San Francisco
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- Legal Professionals, South San Francisco
- Life Insurance, South San Francisco
- Lighting Consultants, South San Francisco
- Lighting Contractors, South San Francisco
- Lighting Fixtures & Equipment, South San Francisco
- Lighting Fixtures Repair, Maintenance & Installation, South San Francisco
- Limousine Dealers, South San Francisco
- Limousine Service, South San Francisco
- Linen Supply Services, South San Francisco
- Liquor Stores, South San Francisco
- Lithographic Printing, South San Francisco
- Loading Dock Equipment, South San Francisco
- Loans Personal, South San Francisco
- Local & Short Haul Trucking Companies, South San Francisco
- Locks, South San Francisco
- Locksmiths, South San Francisco - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, South San Francisco
- Lodging, South San Francisco
- Lodging Services, South San Francisco
- Logistics Freight, South San Francisco
- Long Haul Trucking Companies, South San Francisco
- Luggage & Accessories , South San Francisco
- Lumber & Lumber Products, South San Francisco
- Lumber & Lumber Products, South San Francisco
- Lumber & Wood Products Manufacturers, South San Francisco
- Lumber Importer, South San Francisco
- Lutheran Church, South San Francisco
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