- Labels & Tags, Thurmont
- Laboratories Medical, Thurmont
- Landscape Contractors & Designers, Thurmont
- Landscape Garden Services, Thurmont
- Landscaping, Thurmont
- Landscaping Materials & Supplies, Thurmont
- Lawn & Garden Equipment & Supplies, Thurmont
- Lawn & Garden Services, Thurmont
- Lawn Maintenance Services, Thurmont
- Lawn Mower Repair & Blade Sharpening Service, Thurmont
- Lawn Mowers & Power Equipment, Thurmont
- Lawyers & Attorneys, Thurmont
- Legal Professionals, Thurmont
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- Libraries, Thurmont
- Lighting Consultants, Thurmont
- Lighting Consultants & Designers, Thurmont
- Lighting Contractors, Thurmont
- Liquor Stores, Thurmont
- Livestock, Thurmont
- Lodging, Thurmont
- Lodging Services, Thurmont
- Loggers, Thurmont
- Long Haul Trucking Companies, Thurmont
- Lumber Companies, Thurmont - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Thurmont
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