- Labor & Employment Consultants, Herndon
- Labor Organizations, Herndon
- Laboratories Dental, Herndon
- Laboratories Medical, Herndon
- Land Surveyor, Herndon - Land Surveying Services
- Landscape Contractors & Designers, Herndon
- Landscape Garden Services, Herndon
- Landscaping, Herndon
- Laser Printers, Herndon - Office Supplies
- Late Night Restaurants, Herndon
- Latin American Restaurants, Herndon
- Laundry Self Service, Herndon
- Lawn & Garden Equipment & Supplies, Herndon
- Lawn & Garden Services, Herndon
- Lawn Maintenance Services, Herndon
- Lawn Mowers & Power Equipment, Herndon
- Lawyers & Attorneys, Herndon
- Lead Inspection, Testing & Consulting, Herndon - Lead Paint
- Legal & Tax Services, Herndon
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- Legal Forms & Supplies , Herndon
- Legal Information & Referral Services, Herndon
- Legal Professionals, Herndon
- Licensed Counselors, Herndon
- Life Insurance, Herndon
- Lighting Fixtures & Equipment, Herndon
- Limousine Service, Herndon
- Live Theaters, Herndon
- Living Room Furniture, Herndon
- Loans Personal, Herndon
- Locks, Herndon
- Locksmiths, Herndon - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Herndon
- Lodging, Herndon
- Lodging Services, Herndon
- Long Haul Trucking Companies, Herndon
- Lumber & Lumber Products, Herndon
- Lutheran Church, Herndon
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