- Labor & Employment Consultants, Mendham
- Landscape Contractors & Designers, Mendham
- Landscaping, Mendham
- Laundry Self Service, Mendham
- Lawn & Garden Equipment & Supplies, Mendham
- Lawyers & Attorneys, Mendham
- Legal & Tax Services, Mendham
- Legal Professionals, Mendham
- Libraries, Mendham
- Life Insurance, Mendham
- Limousine Service, Mendham
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- Liquor Stores, Mendham
- Litigation / Trial Attorneys & Lawyers, Mendham
- Loans Personal, Mendham
- Locks, Mendham
- Locksmiths, Mendham - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Mendham
- Lodging, Mendham
- Long Haul Trucking Companies, Mendham
- Lumber & Lumber Products, Mendham
- Lumber & Lumber Products, Mendham
- Lutheran Church, Mendham
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