- Land Development & Planning Engineer, Helena
- Land Surveyor, Helena - Land Surveying Services
- Laundromats & Dry-Cleaning, Coin-Operated, Helena
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Helena
- Lawyers & Attorneys, Helena
- Legal Professionals, Helena
- Libraries, Helena
- Life Insurance, Helena
- Lighting Consultants, Helena
- Lighting Contractors, Helena
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- Lime & Limestone, Helena
- Liquor Stores, Helena
- Livestock, Helena
- Loans Personal, Helena
- Locks, Helena
- Locksmiths, Helena - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Helena
- Lodging, Helena
- Lumber & Wood Products Manufacturers, Helena
- Lumber Companies, Helena - Wholesale, Manufacturers & Suppliers
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