- Labor Organizations, Montville
- Laboratories Dental, Montville
- Laboratories Medical, Montville
- Land Surveyor, Montville - Land Surveying Services
- Landscape Contractors & Designers, Montville
- Landscaping, Montville
- Lawn & Garden Services, Montville
- Lawn Maintenance Services, Montville
- Lawyers & Attorneys, Montville
- Legal Professionals, Montville
- Libraries, Montville
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- Lighting Fixtures & Equipment, Montville
- Limousine Service, Montville
- Liquor Stores, Montville
- Live Theaters, Montville
- Livestock, Montville
- Livestock Dealers, Montville
- Loans Personal, Montville
- Locksmiths, Montville - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Montville
- Long Haul Trucking Companies, Montville
- Lutheran Church, Montville
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