- Laboratories Dental, Altamont
- Laboratories Medical, Altamont
- Landscape Contractors & Designers, Altamont
- Landscape Lighting, Altamont
- Landscaping, Altamont
- Landscaping Materials & Supplies, Altamont
- Lawn & Garden Equipment & Supplies, Altamont
- Lawn & Garden Services, Altamont
- Lawn Maintenance Services, Altamont
- Lawn Mowers & Power Equipment, Altamont
- Lawyers & Attorneys, Altamont
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- Legal Professionals, Altamont
- Libraries, Altamont
- Liquor Stores, Altamont
- Loans Personal, Altamont
- Lodging, Altamont
- Long Haul Trucking Companies, Altamont
- Lumber & Lumber Products, Altamont
- Lumber & Lumber Products, Altamont
- Lumber & Wood Products Manufacturers, Altamont
- Lumber Companies, Altamont - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Altamont
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