- Laboratories Medical, Northampton
- Ladder & Lift Equipment & Machine Rental, Northampton
- Landscape Contractors & Designers, Northampton
- Landscape Design & Installation, Northampton
- Landscaping, Northampton
- Landscaping Materials & Supplies, Northampton
- Late Night Restaurants, Northampton
- Lawn & Garden Equipment & Supplies, Northampton
- Lawn & Yard, Northampton
- Lawn Mower Repair & Blade Sharpening Service, Northampton
- Lawn Mowers & Power Equipment, Northampton
- Lawyers & Attorneys, Northampton
- Legal & Tax Services, Northampton
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- Legal Professionals, Northampton
- Libraries, Northampton
- License Services, Northampton
- Life Insurance, Northampton
- Limousine Service, Northampton
- Liquor Stores, Northampton
- Litigation / Trial Attorneys & Lawyers, Northampton
- Livestock, Northampton
- Local & Short Haul Trucking Companies, Northampton
- Lodging, Northampton
- Long Haul Trucking Companies, Northampton
- Lumber Companies, Northampton - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Northampton
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