- Labor & Employment Consultants, Humboldt
- Land Surveyor, Humboldt - Land Surveying Services
- Laundry Self Service, Humboldt
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Humboldt
- Lawn & Garden Equipment & Supplies, Humboldt
- Lawn Mowers & Power Equipment, Humboldt
- Lawyers & Attorneys, Humboldt
- Legal Professionals, Humboldt
- Libraries, Humboldt
- Life Insurance, Humboldt
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- Liquor Stores, Humboldt
- Livestock, Humboldt
- Locksmiths, Humboldt - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Humboldt
- Lodging Services, Humboldt
- Long Haul Trucking Companies, Humboldt
- Lottery Game Retailers, Humboldt
- Lumber & Lumber Products, Humboldt
- Lumber & Lumber Products, Humboldt
- Lutheran Church, Humboldt
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