- Machinery, Supplies & Equipment - Business Production Related, Magna
- Major Appliances, Magna - Household & Kitchen
- Management Consultants & Services, Magna
- Manicurists & Pedicurists, Magna
- Manufacturing, Magna
- Manufacturing Products, Magna
- Marriage & Family Counselors, Magna
- Masonry Materials & Supplies, Magna
- Medical Diagnostic Clinics, Magna - Clinical Labs & Centers
- Medical Research, Magna
- Medical Research & Development, Magna - Medical Information & Research
- Meeting & Event Planning Services, Magna - Conference Consultants
- Men's Clothing Stores, Magna - Clothes & Accessories
- Mental Health Specialists, Magna - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Food & Goods Products, Magna
- Mexican Restaurants, Magna
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- Millwork Contractors, Magna
- Mini & Self Storage, Magna
- Mining, Magna
- Miscellaneous Household Item Repair, Magna
- Miscellaneous Agriculture, Magna
- Miscellaneous Government, Magna
- Miscellaneous Manufacturing, Magna
- Miscellaneous Personal Services, Magna
- Mobile Home Parks & Communities , Magna
- Mortgages & Loans, Magna
- Mosquito Control, Magna
- Motor Vehicle, Magna
- Motor Vehicle Rental & Leasing, Magna
- Movie Theaters, Magna
- Moving Truck Rental , Magna
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