- Laboratories Medical, Sewickley
- Land Management, Sewickley
- Landscape Contractors & Designers, Sewickley
- Landscaping, Sewickley
- Landscaping Materials & Supplies, Sewickley
- Lawn & Garden Services, Sewickley
- Lawn & Tree Service, Sewickley
- Lawn Maintenance Services, Sewickley
- Lawyers & Attorneys, Sewickley
- Legal & Tax Services, Sewickley
- Legal Professionals, Sewickley
- Libraries, Sewickley
- Life Insurance, Sewickley
- Lighting Fixtures & Equipment, Sewickley
- Limousine Service, Sewickley
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- Linens, Sewickley
- Liquid Waste Treatment, Sewickley
- Liquor Stores, Sewickley
- Livestock, Sewickley
- Livestock Dealers, Sewickley
- Loans Personal, Sewickley
- Local & Short Haul Trucking Companies, Sewickley
- Locks, Sewickley
- Locksmiths, Sewickley - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sewickley
- Lodging, Sewickley
- Long Haul Trucking Companies, Sewickley
- Luggage & Accessories , Sewickley
- Lutheran Church, Sewickley
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