- Machine Shop & Tool Repair Service, Porcupine
- Machinery, Supplies & Equipment - Construction & Contractor Related, Porcupine
- Management Consultants & Services, Porcupine
- Manufacturing, Porcupine
- Manufacturing Products, Porcupine
- Mechanical Contractors, Porcupine - Install, Service & Repair
- Mental Health Specialists, Porcupine - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Porcupine
- Mining, Porcupine
- Mining Contractors, Porcupine - Mining Companies, Contractors & Brokers
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- Mining Equipment & Supplies, Porcupine
- Mining, Crude-Oil Production, Porcupine - Mining Companies
- Miscellaneous Personal Services, Porcupine
- Modular & Mobile Homes For Sale, Porcupine - Manufactured Homes Sale & Service
- Modular Buildings, Porcupine - Modular Homes Buildings & Offices
- Mortgage Bankers & Correspondents, Porcupine
- Motor Vehicle, Porcupine
- Motor Vehicle Rental & Leasing, Porcupine
- Moving Truck Rental , Porcupine
- Museums, Porcupine
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