- Labels & Tags, Newburyport
- Laboratories Dental, Newburyport
- Laboratories Medical, Newburyport
- Lacquers, Stains & Wood Finishes, Newburyport
- Lamp Shades, Newburyport
- Lamps & Lamp Shades Retail, Newburyport - Desk, Table & Floor Lamps
- Land Surveyor, Newburyport - Land Surveying Services
- Landscape Contractors & Designers, Newburyport
- Landscaping, Newburyport
- Landscaping Materials & Supplies, Newburyport
- Late Night Restaurants, Newburyport
- Laundry Self Service, Newburyport
- Lawn & Garden Equipment & Supplies, Newburyport
- Lawn & Garden Services, Newburyport
- Lawn Maintenance Services, Newburyport
- Lawn Mowers & Power Equipment, Newburyport
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- Lawyers & Attorneys, Newburyport
- Leather Goods, Newburyport
- Legal & Tax Services, Newburyport
- Legal Information & Referral Services, Newburyport
- Legal Professionals, Newburyport
- Libraries, Newburyport
- Licensed Counselors, Newburyport
- Linen Supply Services, Newburyport
- Liquor & Beer Manufacturers, Newburyport
- Liquor Stores, Newburyport
- Literary Agents, Newburyport
- Live Theaters, Newburyport
- Loans Personal, Newburyport
- Lodging, Newburyport
- Lumber & Lumber Products, Newburyport
- Lumber & Lumber Products, Newburyport
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