- Machine Shop & Tool Repair Service, Portage
- Machinery, Supplies & Equipment - Business Supplies Related, Portage
- Machinery, Supplies & Equipment - Construction & Contractor Related, Portage
- Manufacturing, Portage
- Membership Sports & Recreation Clubs, Portage
- Mental Health Specialists, Portage - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Portage
- Mining, Portage
- Mining Contractors, Portage - Mining Companies, Contractors & Brokers
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- Mining, Crude-Oil Production, Portage - Mining Companies
- Miscellaneous Government, Portage
- Miscellaneous Photographers, Portage
- Miscellaneous Professional, Portage
- Mission Churches, Portage
- Motor Vehicle, Portage
- Motor Vehicle Rental & Leasing, Portage
- Movie Theaters, Portage
- Moving Truck Rental , Portage
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