- Labor Organizations, Newport
- Laboratories Medical, Newport
- Lamp Shades, Newport
- Lamps & Lamp Shades Retail, Newport - Desk, Table & Floor Lamps
- Land Planning Services, Newport
- Landscape Contractors & Designers, Newport
- Landscape Design & Installation, Newport
- Landscaping, Newport
- Landscaping Materials & Supplies, Newport
- Laser Printers, Newport - Office Supplies
- Laundry Self Service, Newport
- Lawn & Garden Services, Newport
- Lawn Maintenance Services, Newport
- Lawyers & Attorneys, Newport
- Legal & Tax Services, Newport
- Legal Information & Referral Services, Newport
- Legal Professionals, Newport
- Libraries, Newport
- Licensed Counselors, Newport
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- Lighthouses, Newport
- Lighting Consultants & Designers, Newport
- Lighting Fixtures Supplies & Parts Manufacturers, Newport
- Limousine Service, Newport
- Linings Clothing, Newport
- Liquor & Beer Manufacturers, Newport
- Liquor Stores, Newport
- Live Theaters, Newport
- Living Room Furniture, Newport
- Loading Dock Equipment, Newport
- Locks, Newport
- Locksmiths, Newport - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Newport
- Lodging, Newport
- Lodging Services, Newport
- Long Haul Trucking Companies, Newport
- Lumber & Wood Products Manufacturers, Newport
- Lutheran Church, Newport
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