- Labor Organizations, New Martinsville
- Late Night Restaurants, New Martinsville
- Laundry Equipment Rental & Leasing, New Martinsville
- Lawn & Garden Equipment & Supplies, New Martinsville
- Lawn Mowers & Power Equipment, New Martinsville
- Lawyers & Attorneys, New Martinsville
- Legal Professionals, New Martinsville
- Libraries, New Martinsville
- License Services, New Martinsville
- Life Insurance, New Martinsville
- Lime & Limestone, New Martinsville
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- Livestock, New Martinsville
- Loans Personal, New Martinsville
- Lodging, New Martinsville
- Lodging Services, New Martinsville
- Loggers, New Martinsville
- Long Haul Trucking Companies, New Martinsville
- Lumber & Lumber Products, New Martinsville
- Lumber & Lumber Products, New Martinsville
- Lumber Brokers, New Martinsville
- Lutheran Church, New Martinsville
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