- Land Surveyor, Fortuna - Land Surveying Services
- Landscape Contractors & Designers, Fortuna
- Landscape Garden Services, Fortuna
- Landscaping, Fortuna
- Landscaping Materials & Supplies, Fortuna
- Laundromats & Dry-Cleaning, Coin-Operated, Fortuna
- Lawn & Garden Equipment & Supplies, Fortuna
- Lawn & Garden Services, Fortuna
- Lawn Maintenance Services, Fortuna
- Lawn Mower Repair & Blade Sharpening Service, Fortuna
- Lawn Mowers & Power Equipment, Fortuna
- Lawyers & Attorneys, Fortuna
- Leather Goods Cleaners & Dyers, Fortuna
- Legal & Tax Services, Fortuna
- Legal Professionals, Fortuna
- Libraries, Fortuna
- Life Insurance, Fortuna
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- Liquor Stores, Fortuna
- Livestock, Fortuna
- Loans Personal, Fortuna
- Locks, Fortuna
- Locksmiths, Fortuna - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Fortuna
- Lodging, Fortuna
- Lodging Services, Fortuna
- Loggers, Fortuna
- Logging Contractors & Supplies, Fortuna
- Long Haul Trucking Companies, Fortuna
- Lumber & Lumber Products, Fortuna
- Lumber & Lumber Products, Fortuna
- Lumber & Wood Products Manufacturers, Fortuna
- Lumber Companies, Fortuna - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Fortuna
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