- Laboratories Dental, Souderton
- Laboratories Medical, Souderton
- Laminated Structural Products, Souderton
- Landscape Contractors & Designers, Souderton
- Landscaping, Souderton
- Late Night Restaurants, Souderton
- Laundry Self Service, Souderton
- Lawn & Garden Consultants, Souderton
- Lawn & Garden Services, Souderton
- Lawn Maintenance Services, Souderton
- Lawyers & Attorneys, Souderton
- Legal & Tax Services, Souderton
- Legal Professionals, Souderton
- License Services, Souderton
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- Limousine Service, Souderton
- Linens, Souderton
- Liquor Stores, Souderton
- Live Theaters, Souderton
- Livestock, Souderton
- Loans Personal, Souderton
- Locks, Souderton
- Locksmiths, Souderton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Souderton
- Long Haul Trucking Companies, Souderton
- Lumber & Lumber Products, Souderton
- Lumber & Lumber Products, Souderton
- Lumber Companies, Souderton - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Souderton
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