- Machine Shop & Tool Repair Service, New Brunswick
- Machinery, Supplies & Equipment - Business Production Related, New Brunswick
- Machinery, Supplies & Equipment - Business Supplies Related, New Brunswick
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Brunswick
- Magazine & Newspaper Stands, New Brunswick - Dealers & Distributors
- Mailing, Delivery & Courier Service, New Brunswick
- Maintenance, Cleaning & Sanitation, New Brunswick
- Major Appliances, New Brunswick - Household & Kitchen
- Management Consultants & Services, New Brunswick
- Management Training & Development, New Brunswick
- Manicurists & Pedicurists, New Brunswick
- Manufacturing, New Brunswick
- Manufacturing Products, New Brunswick
- Manufacturing Services, New Brunswick
- Marine Contractors & Designers, New Brunswick
- Marriage & Family Counselors, New Brunswick
- Martial Arts & Self Defense Schools, New Brunswick
- Masonry Contractors, New Brunswick - Stone Mason, Brick Mason - Install & Repair
- Mass Transit Vehicle Dealers, New Brunswick
- Massage Therapists & Professional, New Brunswick
- Massage Therapy, New Brunswick
- Meat Market, Wholesale & Products, New Brunswick
- Medical & Health Service Organizations, New Brunswick
- Medical Diagnostic Clinics, New Brunswick - Clinical Labs & Centers
- Medical Groups & Clinics, New Brunswick - Medical & Health Centers
- Medical Supplies & Equipment, New Brunswick
- Men's Clothing Stores, New Brunswick - Clothes & Accessories
- Mental & Developmental Information & Referral Services, New Brunswick
- Mental Health Specialists, New Brunswick - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, New Brunswick
- Metal Pigment & Paint Products, New Brunswick
- Metal Plating & Polishing, New Brunswick
- Metal Products, New Brunswick
- Methodist Church, New Brunswick
- Mexican Food & Goods Products, New Brunswick
- Mexican Restaurants, New Brunswick
- Middle Eastern Restaurants, New Brunswick
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- Mildew Removal & Control, New Brunswick - Mold Removal
- Milk & Milk Products, New Brunswick
- Mini & Self Storage, New Brunswick
- Mirrors, New Brunswick - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, New Brunswick
- Miscellaneous Business Services, New Brunswick
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, New Brunswick
- Miscellaneous Government, New Brunswick
- Miscellaneous Manufacturing, New Brunswick
- Miscellaneous Personal Services, New Brunswick
- Miscellaneous Photographers, New Brunswick
- Miscellaneous Professional, New Brunswick
- Mission Churches, New Brunswick
- Money Transfer Service, New Brunswick
- Monuments, Tombstones, Markers & Memorials, New Brunswick
- Mortgage Bankers & Correspondents, New Brunswick
- Mortgages & Loans, New Brunswick
- Motion Picture Pre & Post Production Services, New Brunswick
- Motor Vehicle, New Brunswick
- Motor Vehicle Rental & Leasing, New Brunswick
- Motorcycle Parts, Accessories & Dealers, New Brunswick
- Movie Theaters, New Brunswick
- Moving & Storage Supplies & Equipment, New Brunswick
- Moving Companies, New Brunswick
- Moving Supplies & Equipment Rental, New Brunswick
- Moving Truck Rental , New Brunswick
- Muffler Shop & Exhaust Systems, New Brunswick
- Multimedia Publishers, New Brunswick - Multimedia Services & Systems
- Museums, New Brunswick
- Music, New Brunswick
- Music Lessons, New Brunswick
- Music Lessons - Vocal, New Brunswick
- Music Live & Pre Recorded, New Brunswick
- Musical Instrument Rental, New Brunswick - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, New Brunswick
- Musical Recording Services, New Brunswick
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