- Labor & Employment Consultants, Arlington
- Laboratories Medical, Arlington
- Land Surveyor, Arlington - Land Surveying Services
- Landscape Contractors & Designers, Arlington
- Landscaping, Arlington
- Language Schools, Arlington
- Late Night Restaurants, Arlington
- Lawn & Garden Equipment & Supplies, Arlington
- Lawn Mowers & Power Equipment, Arlington
- Lawyers & Attorneys, Arlington
- Legal & Tax Services, Arlington
- Legal Professionals, Arlington
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- Libraries, Arlington
- Library Furniture, Arlington
- Liquor Stores, Arlington
- Lithographic Printing, Arlington
- Live Theaters, Arlington
- Loans Personal, Arlington
- Locks, Arlington
- Locksmiths, Arlington - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Arlington
- Lodging, Arlington
- Long Haul Trucking Companies, Arlington
- Lutheran Church, Arlington
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