- Labor & Employment Consultants, Arcata
- Labor Organizations, Arcata
- Laboratories Medical, Arcata
- Land Surveyor, Arcata - Land Surveying Services
- Landscape Contractors & Designers, Arcata
- Landscape Garden Services, Arcata
- Landscaping, Arcata
- Landscaping Materials & Supplies, Arcata
- Laundromats & Dry-Cleaning, Coin-Operated, Arcata
- Laundry & Dry Cleaning Equipment & Supplies, Arcata - Cleaners & Dryers Sales, Repair, Service & Leasing
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Arcata
- Lawn & Garden Equipment & Supplies, Arcata
- Lawn & Garden Services, Arcata
- Lawn Furnishings, Arcata
- Lawyers & Attorneys, Arcata
- Legal & Tax Services, Arcata
- Legal Professionals, Arcata
- Life Insurance, Arcata
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- Lighting Consultants, Arcata
- Lighting Contractors, Arcata
- Lighting Equipment Manufacturers, Arcata
- Lighting Plants Manufacturers, Arcata
- Liquor Stores, Arcata
- Livestock, Arcata
- Living Room Furniture, Arcata
- Loans Personal, Arcata
- Lodging, Arcata
- Lodging Services, Arcata
- Loggers, Arcata
- Logging Contractors & Supplies, Arcata
- Long Haul Trucking Companies, Arcata
- Lumber & Lumber Products, Arcata
- Lumber & Lumber Products, Arcata
- Lumber & Wood Products Manufacturers, Arcata
- Lumber Companies, Arcata - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Arcata
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