- Laboratories Dental, Hacienda Heights
- Laboratories Medical, Hacienda Heights
- Laboratories X-Ray, Hacienda Heights
- Landscape Contractors & Designers, Hacienda Heights
- Landscape Garden Services, Hacienda Heights
- Landscaping, Hacienda Heights
- Late Night Restaurants, Hacienda Heights
- Lawn & Garden Services, Hacienda Heights
- Lawyers & Attorneys, Hacienda Heights
- Legal Professionals, Hacienda Heights
- Libraries, Hacienda Heights
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- Life Insurance, Hacienda Heights
- Limousine Service, Hacienda Heights
- Liquor Stores, Hacienda Heights
- Loans Personal, Hacienda Heights
- Locks, Hacienda Heights
- Locksmiths, Hacienda Heights - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Hacienda Heights
- Lodging, Hacienda Heights
- Logistics Freight, Hacienda Heights
- Long Haul Trucking Companies, Hacienda Heights
- Lutheran Church, Hacienda Heights
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