- Labor Organizations, Newark
- Laboratories Medical, Newark
- Land Planning Services, Newark
- Land Surveyor, Newark - Land Surveying Services
- Landscape Contractors & Designers, Newark
- Landscaping, Newark
- Landscaping Materials & Supplies, Newark
- Late Night Restaurants, Newark
- Laundromats & Dry-Cleaning, Coin-Operated, Newark
- Laundry Self Service, Newark
- Lawn & Garden Equipment & Supplies, Newark
- Lawn & Garden Services, Newark
- Lawn Hydroseeding, Newark
- Lawn Maintenance Services, Newark
- Lawn Mower Repair & Blade Sharpening Service, Newark
- Lawn Mowers & Power Equipment, Newark
- Lawyers & Attorneys, Newark
- Legal Professionals, Newark
- Libraries, Newark
- License Services, Newark
- Life Insurance, Newark
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- Lighting Fixtures & Equipment, Newark
- Linen Supply Services, Newark
- Liquid Filters, Newark
- Liquor Stores, Newark
- Live Theaters, Newark
- Livestock, Newark
- Loans Personal, Newark
- Local & Short Haul Trucking Companies, Newark
- Locks, Newark
- Locksmiths, Newark - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Newark
- Lodging, Newark
- Loggers, Newark
- Long Haul Trucking Companies, Newark
- Lubricating Oils , Newark - Motor Oil
- Lubricating Oils & Greases, Newark
- Lumber & Lumber Products, Newark
- Lumber Brokers, Newark
- Lumber Companies, Newark - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Newark
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