- Machinery, Supplies & Equipment - Business Supplies Related, Youngtown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Youngtown
- Manufacturing, Youngtown
- Marriage & Family Counselors, Youngtown
- Massage Therapy, Youngtown
- Membership Sports & Recreation Clubs, Youngtown
- Mental Health Specialists, Youngtown - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Youngtown
- Mini & Self Storage, Youngtown
- Ministries Church, Youngtown
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- Mirrors, Youngtown - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Youngtown
- Miscellaneous Business Services, Youngtown
- Miscellaneous Professional, Youngtown
- Motor Vehicle, Youngtown
- Motor Vehicle Rental & Leasing, Youngtown
- Motorcycle Repair & Service, Youngtown
- Motorcycles Paint & Refinishing, Youngtown
- Moving Truck Rental , Youngtown
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