- Machine Shop & Tool Repair Service, Newark
- Machine Shop Rotary Surface Grinding, Newark - Tool Grinding & Sharpening
- Machinery, Supplies & Equipment - Business Supplies Related, Newark
- Machinery, Supplies & Equipment - Construction & Contractor Related, Newark
- Mail Delivery Service, Newark
- Major Appliances, Newark - Household & Kitchen
- Malls & Shopping Centers, Newark
- Management Consultants & Services, Newark
- Manicurists & Pedicurists, Newark
- Manufacturing, Newark
- Manufacturing Products, Newark
- Marriage & Family Counselors, Newark
- Martial Arts & Self Defense Schools, Newark
- Masonry Materials & Supplies, Newark
- Mattress & Bedspring Manufacturers, Newark
- Medical Supplies & Equipment, Newark
- Membership Sports & Recreation Clubs, Newark
- Mental Health Specialists, Newark - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Products, Newark
- Methodist Church, Newark
- Mexican Restaurants, Newark
- Mill Supply & Equipment, Newark
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- Mining, Newark
- Miscellaneous Agriculture, Newark
- Miscellaneous Business Services, Newark
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Newark
- Miscellaneous Government, Newark
- Miscellaneous Manufacturing, Newark
- Miscellaneous Professional, Newark
- Monuments, Tombstones, Markers & Memorials, Newark
- Mortgage Bankers & Correspondents, Newark
- Motor Vehicle, Newark
- Motor Vehicle Rental & Leasing, Newark
- Motorcycle Parts, Accessories & Dealers, Newark
- Moving & Storage Supplies & Equipment, Newark
- Moving Companies, Newark
- Moving Supplies & Equipment Rental, Newark
- Moving Truck Rental , Newark
- Muffler Shop & Exhaust Systems, Newark
- Mulch, Peat & Moss Products, Newark
- Museums, Newark
- Music, Newark
- Musical Instruments & Equipment Stores, Newark
- Musical Instruments Repair, Sales & Service, Newark
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