- Labor & Employment Consultants, Dumont
- Labor Organizations, Dumont
- Laboratories Dental, Dumont
- Laboratories Medical, Dumont
- Landscape Contractors & Designers, Dumont
- Landscaping, Dumont
- Late Night Restaurants, Dumont
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Dumont
- Lawn & Garden Equipment & Supplies, Dumont
- Lawn & Garden Services, Dumont
- Lawn & Garden Sprinkler Systems, Dumont
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- Lawn Maintenance Services, Dumont
- Lawyers & Attorneys, Dumont
- Legal & Tax Services, Dumont
- Legal Professionals, Dumont
- Limousine Service, Dumont
- Liquor & Beer Manufacturers, Dumont
- Liquor Stores, Dumont
- Loans Personal, Dumont
- Locksmiths, Dumont - Residence, Commercial, Safe & Auto Car Locksmith
- Lutheran Church, Dumont
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