- Machine Shop, Newark
- Machine Shop & Tool Repair Service, Newark
- Machinery, Supplies & Equipment - Business Production Related, Newark
- Machinery, Supplies & Equipment - Business Supplies Related, Newark
- Machinery, Supplies & Equipment - Construction & Contractor Related, Newark
- Mail Delivery Service, Newark
- Mailing List Service, Brokers & Compilers, Newark
- Mailing, Delivery & Courier Service, Newark
- Maintenance, Cleaning & Sanitation, Newark
- Major Appliances, Newark - Household & Kitchen
- Management Consultants & Services, Newark
- Manicurists & Pedicurists, Newark
- Manufacturing, Newark
- Manufacturing Products, Newark
- Marketing Consultants Professional Practices, Newark
- Marriage & Family Counselors, Newark
- Martial Arts & Self Defense Schools, Newark
- Masonry Contractors, Newark - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Newark
- Massage Therapists & Professional, Newark
- Massage Therapy, Newark
- Material Handling & Heavy Machinery & Equipment, Newark
- Mausoleum Builders, Newark
- Mausoleums Developers, Newark
- Meat Market, Wholesale & Products, Newark
- Medical Billing Services, Newark
- Medical Equipment Manufacturers, Newark
- Medical Groups & Clinics, Newark - Medical & Health Centers
- Medical Supplies & Equipment, Newark
- Membership Sports & Recreation Clubs, Newark
- Mental Health Specialists, Newark - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Newark
- Merchandise Sales Events, Newark
- Metal Buildings, Newark - Wood Buildings
- Metal Buildings, Newark - Kits, Homes, Steel Buildings, etc
- Metal Buyers, Newark
- Metal Coating & Allied Services, Newark
- Metal Plating & Polishing, Newark
- Metal Products, Newark
- Metal Repair Service & Blacksmith, Newark - Iron Works
- Metal Tablets, Newark
- Metal Tanks, Newark
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- Methodist Church, Newark
- Mexican Restaurants, Newark
- Michelin Tires, Newark - Dealers
- Middle Eastern Restaurants, Newark
- Mildew Removal & Control, Newark - Mold Removal
- Millwork Contractors, Newark
- Mini & Self Storage, Newark
- Mining, Newark
- Ministries Church, Newark
- Miscellaneous Prosthesis & Appliances, Newark
- Miscellaneous Agriculture, Newark
- Miscellaneous Government, Newark
- Miscellaneous Industry, Newark
- Miscellaneous Manufacturing, Newark
- Miscellaneous Personal Services, Newark
- Miscellaneous Photographers, Newark
- Miscellaneous Professional, Newark
- Mission Churches, Newark
- Mobile Home Parks & Communities , Newark
- Monuments, Tombstones, Markers & Memorials, Newark
- Mortgage Bankers & Correspondents, Newark
- Mortgage Companies, Newark
- Motion Picture Pre & Post Production Services, Newark
- Motor Vehicle, Newark
- Motor Vehicle Rental & Leasing, Newark
- Motorcycle & ATV Repair & Service, Newark
- Motorcycle & Motor Scooters Dealers, Repair & Service, Newark
- Motorcycle Parts, Accessories & Dealers, Newark
- Motorcycle Repair & Service, Newark
- Moving Companies, Newark
- Moving Truck Rental , Newark
- Muffler Shop & Exhaust Systems, Newark
- Mulch, Peat & Moss Products, Newark
- Museums, Newark
- Music, Newark
- Music Lessons, Newark
- Music Lessons - Instrumental, Newark
- Musical Instrument Rental, Newark - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Newark
- Musical Instruments Repair, Sales & Service, Newark
- Musical Recording Services, Newark
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