- Labor & Employment Consultants, Martinsville
- Labor Organizations, Martinsville
- Laboratories Dental, Martinsville
- Laboratories Medical, Martinsville
- Landscape Contractors & Designers, Martinsville
- Landscaping, Martinsville
- Late Night Restaurants, Martinsville
- Lawn & Garden Equipment & Supplies, Martinsville
- Lawn & Garden Services, Martinsville
- Lawn Maintenance Services, Martinsville
- Lawn Mower Repair & Blade Sharpening Service, Martinsville
- Lawn Mowers & Power Equipment, Martinsville
- Lawyers & Attorneys, Martinsville
- Legal & Tax Services, Martinsville
- Legal Professionals, Martinsville
- Libraries, Martinsville
- License Services, Martinsville
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- Licensed Counselors, Martinsville
- Life Insurance, Martinsville
- Limousine Service, Martinsville
- Lingerie & Underwear for Women, Martinsville - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Martinsville
- Live Theaters, Martinsville
- Loans Personal, Martinsville
- Lodging, Martinsville
- Log Homes - Log Cabins Builders, Martinsville - Building Contractors
- Logging Contractors & Supplies, Martinsville
- Logging Equipment & Supplies, Martinsville
- Logging Equipment & Supplies Manufacturers, Martinsville
- Long Haul Trucking Companies, Martinsville
- Lumber Brokers, Martinsville
- Lumber Companies, Martinsville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Martinsville
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