- Laboratories Medical, Norco
- Land Surveyor, Norco - Land Surveying Services
- Landscape Contractors & Designers, Norco
- Landscape Garden Services, Norco
- Landscaping, Norco
- Laser Cutting Manufacturers, Norco
- Late Night Restaurants, Norco
- Lawn & Garden Services, Norco
- Lawn Maintenance Services, Norco
- Lawyers & Attorneys, Norco
- Learning Disabilities Information Services, Norco
- Leather Apparel Goods Manufacturers, Norco
- Leather Goods, Norco
- Leather Goods Cleaners & Dyers, Norco
- Legal & Tax Services, Norco
- Legal Professionals, Norco
- Libraries, Norco
- Life Insurance, Norco
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- Linen Supply Services, Norco
- Linens, Norco
- Lions Clubs, Norco
- Liquor Stores, Norco
- Livestock, Norco
- Livestock Dealers, Norco
- Livestock Trailers, Norco
- Loans Personal, Norco
- Locks, Norco
- Locksmiths, Norco - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Norco
- Lodging, Norco
- Logistics Freight, Norco
- Long Haul Trucking Companies, Norco
- Lumber & Lumber Products, Norco
- Lumber Companies, Norco - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Norco
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