- Laboratories Medical, Northfield
- Laboratories Pathological, Northfield
- Landscape Contractors & Designers, Northfield
- Landscaping, Northfield
- Landscaping Materials & Supplies, Northfield
- Laundry Self Service, Northfield
- Lawn & Garden Services, Northfield
- Lawn Maintenance Services, Northfield
- Lawyers & Attorneys, Northfield
- Legal & Tax Services, Northfield
- Legal Professionals, Northfield
- Libraries, Northfield
- License Services, Northfield
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- Licensed Counselors, Northfield
- Life Insurance, Northfield
- Limousine Service, Northfield
- Liquor Stores, Northfield
- Livestock, Northfield
- Livestock Dealers, Northfield
- Loans Personal, Northfield
- Locks, Northfield
- Locksmiths, Northfield - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Northfield
- Lodging, Northfield
- Long Haul Trucking Companies, Northfield
- Lutheran Church, Northfield
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