- Labor & Employment Consultants, Falls Church
- Labor Organizations, Falls Church
- Laboratories Dental, Falls Church
- Laboratories Medical, Falls Church
- Land Surveyor, Falls Church - Land Surveying Services
- Landscape Contractors & Designers, Falls Church
- Landscaping, Falls Church
- Landscaping Materials & Supplies, Falls Church
- Laser Game Centers, Falls Church
- Late Night Restaurants, Falls Church
- Laundry Equipment Rental & Leasing, Falls Church
- Laundry Self Service, Falls Church
- Lawn & Garden Equipment & Supplies, Falls Church
- Lawn & Garden Services, Falls Church
- Lawn & Yard, Falls Church
- Lawn Furnishings, Falls Church
- Lawn Maintenance Services, Falls Church
- Lawn Mower Repair & Blade Sharpening Service, Falls Church
- Lawyers & Attorneys, Falls Church
- Legal & Tax Services, Falls Church
- Legal Clinics, Falls Church
- Legal Information & Referral Services, Falls Church
- Legal Professionals, Falls Church
- Libraries, Falls Church
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- Licensed Counselors, Falls Church
- Life Insurance, Falls Church
- Lighting Fixtures & Equipment, Falls Church
- Limousine Service, Falls Church
- Linens, Falls Church
- Liquor & Beer Manufacturers, Falls Church
- Liquor Stores, Falls Church
- Live Theaters, Falls Church
- Living Room Furniture, Falls Church
- Loans Personal, Falls Church
- Local & Short Haul Trucking Companies, Falls Church
- Locks, Falls Church
- Locksmiths, Falls Church - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Falls Church
- Lodging, Falls Church
- Lodging Services, Falls Church
- Long Haul Trucking Companies, Falls Church
- Lubricating Oils , Falls Church - Motor Oil
- Lumber & Lumber Products, Falls Church
- Lumber & Lumber Products, Falls Church
- Lumber & Wood Products Manufacturers, Falls Church
- Lumber Companies, Falls Church - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Falls Church
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