- Labels & Tags, Duarte
- Labor Organizations, Duarte
- Laboratories Dental, Duarte
- Laboratories Medical, Duarte
- Land Surveyor, Duarte - Land Surveying Services
- Landscape Contractors & Designers, Duarte
- Landscape Garden Services, Duarte
- Landscaping, Duarte
- Late Night Restaurants, Duarte
- Lawn & Garden Services, Duarte
- Lawn Maintenance Services, Duarte
- Lawyers & Attorneys, Duarte
- Leather Apparel Goods Manufacturers, Duarte
- Leather Goods, Duarte
- Legal & Tax Services, Duarte
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- Legal Professionals, Duarte
- Libraries, Duarte
- Life Insurance, Duarte
- Lighting Consultants, Duarte
- Lighting Contractors, Duarte
- Liquor Stores, Duarte
- Loans Check Cashing, Duarte
- Loans Personal, Duarte
- Loans Title Services, Duarte
- Locks, Duarte
- Locksmiths, Duarte - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Duarte
- Lodging, Duarte
- Lodging Services, Duarte
- Long Haul Trucking Companies, Duarte
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