- Labor & Employment Consultants, Ambler
- Laboratories Medical, Ambler
- Lakes & Ponds Construction Maintenance Restoration & Control, Ambler
- Lamp Shades, Ambler
- Lamps & Lamp Shades Retail, Ambler - Desk, Table & Floor Lamps
- Land Surveyor, Ambler - Land Surveying Services
- Landscape Contractors & Designers, Ambler
- Landscape Garden Services, Ambler
- Landscaping, Ambler
- Late Night Restaurants, Ambler
- Laundry Self Service, Ambler
- Lawn & Garden Equipment & Supplies, Ambler
- Lawn & Garden Services, Ambler
- Lawn & Garden Sprinkler Systems, Ambler
- Lawn Maintenance Services, Ambler
- Lawyers & Attorneys, Ambler
- Leather Goods Cleaners & Dyers, Ambler
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- Legal & Tax Services, Ambler
- Legal Professionals, Ambler
- Libraries, Ambler
- License Services, Ambler
- Licensed Counselors, Ambler
- Lighting Fixtures & Equipment, Ambler
- Lighting Fixtures Repair, Maintenance & Installation, Ambler
- Limousine Service, Ambler
- Liquor Stores, Ambler
- Live Theaters, Ambler
- Livestock, Ambler
- Loans Personal, Ambler
- Locks, Ambler
- Locksmiths, Ambler - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Ambler
- Lodging, Ambler
- Lutheran Church, Ambler
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