- Labor Organizations, Newton Center
- Laboratories Dental, Newton Center
- Laboratories Medical, Newton Center
- Landscaping Materials & Supplies, Newton Center
- Language Schools, Newton Center
- Lawn & Garden Equipment & Supplies, Newton Center
- Lawn & Garden Sprinkler Systems, Newton Center
- Lawn & Garden Supplies & Equipment, Newton Center
- Lawyers & Attorneys, Newton Center
- Legal & Tax Services, Newton Center
- Legal Clinics, Newton Center
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- Legal Professionals, Newton Center
- Lending Services, Newton Center
- Life Insurance, Newton Center
- Liquor Stores, Newton Center
- Loans Personal, Newton Center
- Locksmiths, Newton Center - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Newton Center
- Long Haul Trucking Companies, Newton Center
- Luggage & Accessories , Newton Center
- Luncheonette Restaurants, Newton Center
- Lutheran Church, Newton Center
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