- Land Surveyor, Northampton - Land Surveying Services
- Landscape Contractors & Designers, Northampton
- Landscape Design & Installation, Northampton
- Landscaping, Northampton
- Language Schools, Northampton
- Late Night Restaurants, Northampton
- Laundry Self Service, Northampton
- Lawn & Garden Services, Northampton
- Lawn Maintenance Services, Northampton
- Lawyers & Attorneys, Northampton
- Lead Inspection, Testing & Consulting, Northampton - Lead Paint
- Legal & Tax Services, Northampton
- Legal Information & Referral Services, Northampton
- Legal Professionals, Northampton
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- Libraries, Northampton
- Limousine Service, Northampton
- Lingerie & Underwear for Women, Northampton - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Northampton
- Live Theaters, Northampton
- Locks, Northampton
- Locksmiths, Northampton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Northampton
- Lodging, Northampton
- Lodging Services, Northampton
- Long Haul Trucking Companies, Northampton
- Lumber & Lumber Products, Northampton
- Lumber & Lumber Products, Northampton
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