- Labor Organizations, Ambridge
- Laboratories Medical, Ambridge
- Landscape Contractors & Designers, Ambridge
- Landscaping, Ambridge
- Landscaping Materials & Supplies, Ambridge
- Laundry Self Service, Ambridge
- Lawn & Garden Equipment & Supplies, Ambridge
- Lawn & Garden Sprinkler Systems, Ambridge
- Lawn Mower Repair & Blade Sharpening Service, Ambridge
- Lawn Mowers & Power Equipment, Ambridge
- Lawyers & Attorneys, Ambridge
- Legal & Tax Services, Ambridge
- Legal Professionals, Ambridge
- Letters Of Credit, Ambridge
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- Libraries, Ambridge
- Lighting Fixtures & Equipment, Ambridge
- Limousine Service, Ambridge
- Liquor Stores, Ambridge
- Loans Personal, Ambridge
- Locks, Ambridge
- Locksmiths, Ambridge - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Ambridge
- Lodging, Ambridge
- Long Haul Trucking Companies, Ambridge
- Lottery Game Retailers, Ambridge
- Lumber & Lumber Products, Ambridge
- Lumber & Lumber Products, Ambridge
- Lutheran Church, Ambridge
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