- Laboratories Dental, Fairfax
- Laboratories Medical, Fairfax
- Landscape Contractors & Designers, Fairfax
- Landscape Garden Services, Fairfax
- Landscaping, Fairfax
- Landscaping Materials & Supplies, Fairfax
- Laundromats & Dry-Cleaning, Coin-Operated, Fairfax
- Laundry Self Service, Fairfax
- Lawn & Garden Services, Fairfax
- Lawn Maintenance Services, Fairfax
- Lawyers & Attorneys, Fairfax
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- Legal Professionals, Fairfax
- Libraries, Fairfax
- Life Insurance, Fairfax
- Liquor Stores, Fairfax
- Locks, Fairfax
- Locksmiths, Fairfax - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Fairfax
- Lodging, Fairfax
- Lumber & Lumber Products, Fairfax
- Lutheran Church, Fairfax
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