- Laboratories Dental, Lockport
- Laboratories Medical, Lockport
- Land Surveyor, Lockport - Land Surveying Services
- Landscape Contractors & Designers, Lockport
- Landscaping, Lockport
- Landscaping Materials & Supplies, Lockport
- Lawn & Garden Equipment & Supplies, Lockport
- Lawn & Garden Services, Lockport
- Lawn & Garden Sprinkler Systems, Lockport
- Lawn Maintenance Services, Lockport
- Lawn Mower Repair & Blade Sharpening Service, Lockport
- Lawyers & Attorneys, Lockport
- Leather Goods Stores & Dealers, Lockport
- Legal & Tax Services, Lockport
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- Legal Information & Referral Services, Lockport
- Legal Professionals, Lockport
- Life Insurance, Lockport
- Lighting Fixtures & Equipment, Lockport
- Limousine Service, Lockport
- Liquor Stores, Lockport
- Loans Personal, Lockport
- Locks, Lockport
- Locksmiths, Lockport - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Lockport
- Lodging, Lockport
- Logistics Freight, Lockport
- Long Haul Trucking Companies, Lockport
- Lutheran Church, Lockport
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