- Laboratories Dental, Derry
- Laboratories Medical, Derry
- Land Surveyor, Derry - Land Surveying Services
- Landscape Contractors & Designers, Derry
- Landscaping, Derry
- Late Night Restaurants, Derry
- Laundry Self Service, Derry
- Lawn & Garden Services, Derry
- Lawn Maintenance Services, Derry
- Lawn Mower Repair & Blade Sharpening Service, Derry
- Lawyers & Attorneys, Derry
- Legal & Tax Services, Derry
- Legal Professionals, Derry
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- Lending Services, Derry
- Limousine Service, Derry
- Liquor & Beer Manufacturers, Derry
- Live Theaters, Derry
- Livestock, Derry
- Locks, Derry
- Locksmiths, Derry - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Derry
- Lodging, Derry
- Long Haul Trucking Companies, Derry
- Lumber & Lumber Products, Derry
- Lumber & Lumber Products, Derry
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