- Machine Shop & Tool Repair Service, Powassan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Powassan
- Mailing, Delivery & Courier Service, Powassan
- Manufacturing, Powassan
- Marinas & Marina Services, Powassan
- Massage Therapists & Professional, Powassan
- Massage Therapy, Powassan
- Membership Sports & Recreation Clubs, Powassan
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- Mental Health Specialists, Powassan - Psychologist, Psychiatrist, Psychotherapist, etc
- Midwives, Powassan
- Mini & Self Storage, Powassan
- Miscellaneous Industry, Powassan
- Miscellaneous Professional, Powassan
- Motor Vehicle, Powassan
- Motor Vehicle Rental & Leasing, Powassan
- Museums, Powassan
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