- Labor & Employment Consultants, Diamond Bar
- Labor Organizations, Diamond Bar
- Laboratories Dental, Diamond Bar
- Laboratories Medical, Diamond Bar
- Landscape Contractors & Designers, Diamond Bar
- Landscaping, Diamond Bar
- Laser Printers, Diamond Bar - Office Supplies
- Late Night Restaurants, Diamond Bar
- Lawn & Garden Equipment & Supplies, Diamond Bar
- Lawn & Garden Services, Diamond Bar
- Lawn Mower Repair & Blade Sharpening Service, Diamond Bar
- Lawn Mowers & Power Equipment, Diamond Bar
- Lawyers & Attorneys, Diamond Bar
- Lead Testing, Detection & Removal - Commercial & Industrial, Diamond Bar - Lead Paint
- Lead Testing, Detection & Removal - Residential, Diamond Bar - Lead Paint
- Leather Apparel Goods Manufacturers, Diamond Bar
- Leather Goods, Diamond Bar
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- Legal & Tax Services, Diamond Bar
- Legal Documents Preparation Services, Diamond Bar - Legal Forms
- Legal Professionals, Diamond Bar
- Libraries, Diamond Bar
- Life Insurance, Diamond Bar
- Lingerie & Underwear for Women, Diamond Bar - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Diamond Bar
- Loans Personal, Diamond Bar
- Locks, Diamond Bar
- Locksmiths, Diamond Bar - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Diamond Bar
- Lodging, Diamond Bar
- Lodging Services, Diamond Bar
- Logistics Freight, Diamond Bar
- Long Haul Trucking Companies, Diamond Bar
- Lutheran Church, Diamond Bar
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