- Labor Organizations, Arlington
- Laboratories Dental, Arlington
- Laboratories Medical, Arlington
- Land Companies, Arlington
- Land Development & Planning Engineer, Arlington
- Land Surveyor, Arlington - Land Surveying Services
- Landscape Contractors & Designers, Arlington
- Landscape Design & Installation, Arlington
- Landscaping, Arlington
- Landscaping Materials & Supplies, Arlington
- Late Night Restaurants, Arlington
- Laundry Self Service, Arlington
- Lawn & Garden Equipment & Supplies, Arlington
- Lawn & Garden Services, Arlington
- Lawn Hydroseeding, Arlington
- Lawn Maintenance Services, Arlington
- Lawyers & Attorneys, Arlington
- Legal & Tax Services, Arlington
- Legal Information & Referral Services, Arlington
- Legal Professionals, Arlington
- License Services, Arlington
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- Licensed Counselors, Arlington
- Life Insurance, Arlington
- Limousine Service, Arlington
- Livestock, Arlington
- Livestock Feeding Service, Arlington
- Loans Personal, Arlington
- Local & Short Haul Trucking Companies, Arlington
- Locks, Arlington
- Locksmiths, Arlington - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Arlington
- Lodging, Arlington
- Lodging Services, Arlington
- Loggers, Arlington
- Logging Contractors & Supplies, Arlington
- Long Haul Trucking Companies, Arlington
- Lubricating Oils , Arlington - Motor Oil
- Lumber & Lumber Products, Arlington
- Lumber & Lumber Products, Arlington
- Lumber Brokers, Arlington
- Lutheran Church, Arlington
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