- Machine Shop & Tool Repair Service, Lambertville
- Machinery, Supplies & Equipment - Business Production Related, Lambertville
- Machinery, Supplies & Equipment - Business Supplies Related, Lambertville
- Mail Delivery Service, Lambertville
- Manicurists & Pedicurists, Lambertville
- Manufacturers Agents & Representatives, Lambertville
- Manufacturers Representative, Lambertville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Lambertville
- Marriage & Family Counselors, Lambertville
- Martial Arts & Self Defense Schools, Lambertville
- Masonry Materials & Supplies, Lambertville
- Massage Therapists & Professional, Lambertville
- Massage Therapy, Lambertville
- Meat Market, Wholesale & Products, Lambertville
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- Medical Diagnostic Clinics, Lambertville - Clinical Labs & Centers
- Medical Supplies & Equipment, Lambertville
- Mental Health Specialists, Lambertville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Lambertville
- Mexican Restaurants, Lambertville
- Mining, Lambertville
- Miscellaneous Government, Lambertville
- Miscellaneous Manufacturing, Lambertville
- Miscellaneous Photographers, Lambertville
- Miscellaneous Professional, Lambertville
- Monuments, Tombstones, Markers & Memorials, Lambertville
- Mortgage Bankers & Correspondents, Lambertville
- Motor Vehicle, Lambertville
- Muslim Church, Lambertville
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