- Laboratories Dental, Montague
- Laboratories Medical, Montague
- Landscape Contractors & Designers, Montague
- Landscaping, Montague
- Laundromats & Dry-Cleaning, Coin-Operated, Montague
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Montague
- Lawn & Garden Equipment & Supplies, Montague
- Lawn & Garden Services, Montague
- Lawn Maintenance Services, Montague
- Lawyers & Attorneys, Montague
- Legal Professionals, Montague
- Libraries, Montague
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- Life Insurance, Montague
- Lime & Limestone, Montague
- Lions Clubs, Montague
- Liquor Stores, Montague
- Livestock, Montague
- Livestock Services, Montague
- Lodging, Montague
- Loggers, Montague
- Long Haul Trucking Companies, Montague
- Lumber & Lumber Products, Montague
- Lumber & Lumber Products, Montague
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