- Labor Organizations, Barstow
- Laboratories Allergy, Barstow
- Laboratories Medical, Barstow
- Land Surveyor, Barstow - Land Surveying Services
- Landscape Contractors & Designers, Barstow
- Landscape Garden Services, Barstow
- Landscaping, Barstow
- Landscaping Materials & Supplies, Barstow
- Late Night Restaurants, Barstow
- Laundry Self Service, Barstow
- Lawn & Garden Equipment & Supplies, Barstow
- Lawn & Garden Services, Barstow
- Lawn Maintenance Services, Barstow
- Lawyers & Attorneys, Barstow
- Leather Goods Stores & Dealers, Barstow
- Legal & Tax Services, Barstow
- Legal Professionals, Barstow
- Libraries, Barstow
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- Life Insurance, Barstow
- Lighting Fixtures & Equipment, Barstow
- Liquor & Beer Manufacturers, Barstow
- Liquor Stores, Barstow
- Livestock, Barstow
- Loans Check Cashing, Barstow
- Loans Personal, Barstow
- Loans Title Services, Barstow
- Local & Short Haul Trucking Companies, Barstow
- Locks, Barstow
- Locksmiths, Barstow - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Barstow
- Lodging, Barstow
- Lodging Services, Barstow
- Long Haul Trucking Companies, Barstow
- Luggage & Accessories , Barstow
- Lutheran Church, Barstow
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