- Labor Organizations, Newton
- Labor Unions, Newton
- Land Surveyor, Newton - Land Surveying Services
- Landscape Contractors & Designers, Newton
- Landscaping, Newton
- Laundromats & Dry-Cleaning, Coin-Operated, Newton
- Laundry Equipment Rental & Leasing, Newton
- Laundry Self Service, Newton
- Lawn & Garden Equipment & Supplies, Newton
- Lawn & Garden Services, Newton
- Lawn Maintenance Services, Newton
- Lawn Mower Repair & Blade Sharpening Service, Newton
- Lawyers & Attorneys, Newton
- Legal Consultants Medical, Newton
- Legal Professionals, Newton
- Libraries, Newton
- Life Insurance, Newton
- Lighting Fixtures & Equipment, Newton
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- Lighting Fixtures Repair, Maintenance & Installation, Newton
- Lime & Limestone, Newton
- Liquor Stores, Newton
- Livestock, Newton
- Livestock Breeders, Newton
- Livestock Equipment & Supplies, Newton
- Livestock Services, Newton
- Loans Personal, Newton
- Locks, Newton
- Locksmiths, Newton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Newton
- Lodging, Newton
- Lodging Services, Newton
- Long Haul Trucking Companies, Newton
- Lumber & Lumber Products, Newton
- Lumber & Lumber Products, Newton
- Lumber Inspectors, Newton
- Lutheran Church, Newton
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