- Laboratories Dental, Gwynn Oak
- Laboratories Medical, Gwynn Oak
- Landscape Contractors & Designers, Gwynn Oak
- Landscaping, Gwynn Oak
- Laundry Self Service, Gwynn Oak
- Lawn & Garden Services, Gwynn Oak
- Lawn Maintenance Services, Gwynn Oak
- Lawyers & Attorneys, Gwynn Oak
- Legal & Tax Services, Gwynn Oak
- Legal Professionals, Gwynn Oak
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- Lighting Fixtures & Equipment, Gwynn Oak
- Liquor Stores, Gwynn Oak
- Living Word Church, Gwynn Oak
- Loans Personal, Gwynn Oak
- Locks, Gwynn Oak
- Locksmiths, Gwynn Oak - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Gwynn Oak
- Lodging, Gwynn Oak
- Long Haul Trucking Companies, Gwynn Oak
- Lutheran Church, Gwynn Oak
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