- Labor Organizations, Monrovia
- Laboratories Biological, Monrovia
- Laboratories Medical, Monrovia
- Land Surveyor, Monrovia - Land Surveying Services
- Landscape Contractors & Designers, Monrovia
- Landscape Garden Services, Monrovia
- Landscape Lighting, Monrovia
- Landscaping, Monrovia
- Landscaping Materials & Supplies, Monrovia
- Late Night Restaurants, Monrovia
- Laundromats & Dry-Cleaning, Coin-Operated, Monrovia
- Laundry Self Service, Monrovia
- Lawn & Garden Equipment & Supplies, Monrovia
- Lawn & Garden Services, Monrovia
- Lawn & Garden Sprinkler Systems, Monrovia
- Lawn Maintenance Services, Monrovia
- Lawyers & Attorneys, Monrovia
- Legal & Tax Services, Monrovia
- Legal Professionals, Monrovia
- Lending Services, Monrovia
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- Libraries, Monrovia
- Life Insurance, Monrovia
- Lighting Fixtures & Equipment, Monrovia
- Lighting Fixtures Repair, Maintenance & Installation, Monrovia
- Limousine Service, Monrovia
- Linen Supply Services, Monrovia
- Linens, Monrovia
- Lingerie & Underwear for Women, Monrovia - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Monrovia
- Loans Personal, Monrovia
- Local & Short Haul Trucking Companies, Monrovia
- Locks, Monrovia
- Locksmiths, Monrovia - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Monrovia
- Lodging, Monrovia
- Logistics Freight, Monrovia
- Long Haul Trucking Companies, Monrovia
- Lumber & Lumber Products, Monrovia
- Lumber & Lumber Products, Monrovia
- Lutheran Church, Monrovia
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