- Laboratories Dental, Northville
- Laboratories Medical, Northville
- Landscape Contractors & Designers, Northville
- Landscaping, Northville
- Landscaping Materials & Supplies, Northville
- Laundry Self Service, Northville
- Lawn & Garden Equipment & Supplies, Northville
- Lawn & Garden Services, Northville
- Lawn & Garden Sprinkler Systems, Northville
- Lawn Maintenance Services, Northville
- Lawn Mower Repair & Blade Sharpening Service, Northville
- Lawn Mowers & Power Equipment, Northville
- Lawyers & Attorneys, Northville
- Legal & Tax Services, Northville
- Legal Professionals, Northville
- Libraries, Northville
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- Life Insurance, Northville
- Lighting Fixtures & Equipment, Northville
- Lighting Fixtures Repair, Maintenance & Installation, Northville
- Linens, Northville
- Liquor Stores, Northville
- Litigation / Trial Attorneys & Lawyers, Northville
- Live Theaters, Northville
- Loans Personal, Northville
- Local & Short Haul Trucking Companies, Northville
- Locks, Northville
- Locksmiths, Northville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Northville
- Lodging, Northville
- Lodging Services, Northville
- Long Haul Trucking Companies, Northville
- Lutheran Church, Northville
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