- Labor & Employment Consultants, Londonderry
- Laboratories Medical, Londonderry
- Landscape Contractors & Designers, Londonderry
- Landscaping, Londonderry
- Landscaping Materials & Supplies, Londonderry
- Laser Printers, Londonderry - Office Supplies
- Lawn & Garden Services, Londonderry
- Lawn Maintenance Services, Londonderry
- Lawyers & Attorneys, Londonderry
- Legal Professionals, Londonderry
- Lending Services, Londonderry
- Licensed Counselors, Londonderry
- Life Insurance, Londonderry
- Lighting Fixtures & Equipment, Londonderry
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- Limousine Service, Londonderry
- Linen Supply Services, Londonderry
- Liquid Waste Treatment, Londonderry
- Liquor & Beer Manufacturers, Londonderry
- Liquor Stores, Londonderry
- Loading Dock Equipment, Londonderry
- Loans Personal, Londonderry
- Locksmiths, Londonderry - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Londonderry
- Lodging Services, Londonderry
- Long Haul Trucking Companies, Londonderry
- Lumber & Lumber Products, Londonderry
- Lumber & Lumber Products, Londonderry
- Lumber Companies, Londonderry - Wholesale, Manufacturers & Suppliers
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