- Machine Shop & Tool Repair Service, Lambertville
- Machinery, Supplies & Equipment - Business Production Related, Lambertville
- Machinery, Supplies & Equipment - Business Supplies Related, Lambertville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lambertville
- Magazine & Newspaper Stands, Lambertville - Dealers & Distributors
- Management Consultants & Services, Lambertville
- Manufacturing, Lambertville
- Manufacturing Products, Lambertville
- Maps & Supplies, Lambertville
- Masonry Contractors, Lambertville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Lambertville
- Medical & Health Service Organizations, Lambertville
- Medical Supplies & Equipment, Lambertville
- Mental Health Specialists, Lambertville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Lambertville
- Metal Foil & Leaf Manufacturers, Lambertville
- Metal Pigment & Paint Products, Lambertville
- Methodist Church, Lambertville
- Mexican Restaurants, Lambertville
- Middle Eastern Restaurants, Lambertville
- Miscellaneous Business Services, Lambertville
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- Miscellaneous Government, Lambertville
- Miscellaneous Personal Services, Lambertville
- Miscellaneous Photographers, Lambertville
- Miscellaneous Professional, Lambertville
- Monuments, Tombstones, Markers & Memorials, Lambertville
- Mortgage Bankers & Correspondents, Lambertville
- Mortgages & Loans, Lambertville
- Motion Picture Pre & Post Production Services, Lambertville
- Motivational & Self Improvement Schools, Lambertville
- Motor Vehicle, Lambertville
- Motor Vehicle Rental & Leasing, Lambertville
- Moving & Storage Supplies & Equipment, Lambertville
- Moving Truck Rental , Lambertville
- Multimedia Publishers, Lambertville - Multimedia Services & Systems
- Museums, Lambertville
- Music, Lambertville
- Music Entertainment, Lambertville
- Music Lessons, Lambertville
- Music Lessons - Instrumental, Lambertville
- Musical Instrument Rental, Lambertville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Lambertville
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