- Machine Shop, South Amboy
- Machinery, Supplies & Equipment - Business Production Related, South Amboy
- Machinery, Supplies & Equipment - Business Supplies Related, South Amboy
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Amboy
- Major Appliances, South Amboy - Household & Kitchen
- Malls & Shopping Centers, South Amboy
- Management Consultants & Services, South Amboy
- Manicurists & Pedicurists, South Amboy
- Manufacturing, South Amboy
- Manufacturing & Industrial Consultants, South Amboy
- Marinas & Marina Services, South Amboy
- Marine Electronic Equipment, South Amboy
- Marine Products And Services, South Amboy
- Marine Repair & Service Stations, South Amboy
- Marine Supplies & Equipment, South Amboy - Boat Supplies
- Marine Supplies & Equipment Repair, South Amboy - Boat Supplies & Equipment
- Masonry Contractors, South Amboy - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, South Amboy
- Massage Therapists & Professional, South Amboy
- Massage Therapy, South Amboy
- Meat Market, Wholesale & Products, South Amboy
- Mechanical Contractors, South Amboy - Install, Service & Repair
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- Medical Diagnostic Clinics, South Amboy - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, South Amboy
- Ministries Church, South Amboy
- Miscellaneous Business Services, South Amboy
- Miscellaneous Government, South Amboy
- Miscellaneous Personal Services, South Amboy
- Miscellaneous Photographers, South Amboy
- Miscellaneous Professional, South Amboy
- Mortgage Bankers & Correspondents, South Amboy
- Mortgages & Loans, South Amboy
- Motion Picture & Television Production Services, South Amboy
- Motion Picture Dists & Producers, South Amboy
- Motion Picture Pre & Post Production Services, South Amboy
- Motor Vehicle, South Amboy
- Motor Vehicle Rental & Leasing, South Amboy
- Motorcycle Parts, Accessories & Dealers, South Amboy
- Moving Companies, South Amboy
- Moving Supplies & Equipment Rental, South Amboy
- Moving Truck Rental , South Amboy
- Music, South Amboy
- Musical Instrument Rental, South Amboy - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, South Amboy
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