- Labor & Employment Consultants, Reston
- Labor And Employment Relations Attorneys & Lawyers, Reston
- Labor And Employment Relations Lawyers & Attorneys, Reston
- Laboratories Dental, Reston
- Laboratories Medical, Reston
- Ladies Ready To Wear, Reston
- Land Companies, Reston
- Land Surveyor, Reston - Land Surveying Services
- Landscape Contractors & Designers, Reston
- Landscaping, Reston
- Landscaping Materials & Supplies, Reston
- Language Schools, Reston
- Late Night Restaurants, Reston
- Lawn & Garden Services, Reston
- Lawn Maintenance Services, Reston
- Lawyers & Attorneys, Reston
- Legal & Tax Services, Reston
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- Legal Professionals, Reston
- Libraries, Reston
- License Services, Reston
- Life Insurance, Reston
- Lighting Fixtures & Equipment, Reston
- Limousine Service, Reston
- Lingerie & Underwear for Women, Reston - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Reston
- Loans Personal, Reston
- Locks, Reston
- Locksmiths, Reston - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Reston
- Lodging, Reston
- Log Homes - Log Cabins Builders, Reston - Building Contractors
- Long Haul Trucking Companies, Reston
- Lutheran Church, Reston
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