- Machine Shop, Flint
- Machine Shop & Tool Repair Service, Flint
- Machinery, Supplies & Equipment - Business Production Related, Flint
- Machinery, Supplies & Equipment - Construction & Contractor Related, Flint
- Mail Delivery Service, Flint
- Mammography Clinics, Flint - Breast Cancer Screening
- Manicurists & Pedicurists, Flint
- Manufacturing, Flint
- Manufacturing Products, Flint
- Marble, Flint
- Marine Supplies & Equipment, Flint - Boat Supplies
- Marriage & Family Counselors, Flint
- Masonry Materials & Supplies, Flint
- Massage Therapists & Professional, Flint
- Massage Therapy, Flint
- Mechanical Engineer, Flint - Mechanical Engineering Service
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Flint
- Medical Supplies & Equipment, Flint
- Mental Health Specialists, Flint - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Flint
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- Mini & Self Storage, Flint
- Ministries Church, Flint
- Miscellaneous Business Product Repair, Flint
- Miscellaneous Motor Vehicles, Flint
- Miscellaneous Personal Services, Flint
- Miscellaneous Photographers, Flint
- Miscellaneous Professional, Flint
- Mobile Home Parks & Communities , Flint
- Mortgage Bankers & Correspondents, Flint
- Motion Picture Pre & Post Production Services, Flint
- Motor Vehicle, Flint
- Motor Vehicle Rental & Leasing, Flint
- Motorcycle Parts, Accessories & Dealers, Flint
- Moving Companies, Flint
- Moving Supplies & Equipment Rental, Flint
- Moving Truck Rental , Flint
- Music, Flint
- Music Lessons, Flint
- Music Lessons - Instrumental, Flint
- Musical Instruments Repair, Sales & Service, Flint
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