- Labor & Employment Consultants, Northborough
- Labor Organizations, Northborough
- Laboratories Dental, Northborough
- Laboratories Medical, Northborough
- Lamp Repair, Northborough
- Land Planning Services, Northborough
- Land Surveyor, Northborough - Land Surveying Services
- Landscape Contractors & Designers, Northborough
- Landscaping, Northborough
- Landscaping Materials & Supplies, Northborough
- Laundry Self Service, Northborough
- Lawn & Garden Equipment & Supplies, Northborough
- Lawn & Garden Services, Northborough
- Lawn & Garden Sprinkler Systems, Northborough
- Lawn & Garden Supplies & Equipment, Northborough
- Lawn Maintenance Services, Northborough
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- Lawyers & Attorneys, Northborough
- Lead Testing, Detection & Removal - Commercial & Industrial, Northborough - Lead Paint
- Lead Testing, Detection & Removal - Residential, Northborough - Lead Paint
- Legal & Tax Services, Northborough
- Legal Professionals, Northborough
- Lighting Fixtures & Equipment, Northborough
- Liquor Stores, Northborough
- Loans Personal, Northborough
- Locks, Northborough
- Locksmiths, Northborough - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Northborough
- Lodging, Northborough
- Lodging Services, Northborough
- Long Haul Trucking Companies, Northborough
- Lumber & Lumber Products, Northborough
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