- Labor Organizations, Newton
- Laboratories Dental, Newton
- Laboratories Medical, Newton
- Land Surveyor, Newton - Land Surveying Services
- Landscape Contractors & Designers, Newton
- Landscaping, Newton
- Landscaping Materials & Supplies, Newton
- Late Night Restaurants, Newton
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Newton
- Lawn & Garden Equipment & Supplies, Newton
- Lawn & Garden Services, Newton
- Lawn Maintenance Services, Newton
- Lawn Mowers & Power Equipment, Newton
- Lawyers & Attorneys, Newton
- Legal Professionals, Newton
- Libraries, Newton
- Life Insurance, Newton
- Lime & Limestone, Newton
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- Liquor Stores, Newton
- Live Theaters, Newton
- Livestock, Newton
- Loans Personal, Newton
- Local & Short Haul Trucking Companies, Newton
- Locks, Newton
- Locksmiths, Newton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Newton
- Lodging, Newton
- Lodging Services, Newton
- Logistics Freight, Newton
- Long Haul Trucking Companies, Newton
- Luggage & Accessories , Newton
- Lumber & Lumber Products, Newton
- Lumber & Lumber Products, Newton
- Lumber Companies, Newton - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Newton
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