- Machine Shop & Tool Repair Service, South Porcupine
- Machine Shops Slings, South Porcupine
- Machinery, Supplies & Equipment - Business Production Related, South Porcupine
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Porcupine
- Major Appliances, South Porcupine - Household & Kitchen
- Management Consultants & Services, South Porcupine
- Manufacturing, South Porcupine
- Manufacturing Products, South Porcupine
- Massage Therapists & Professional, South Porcupine
- Massage Therapy, South Porcupine
- Mechanical Contractors, South Porcupine - Install, Service & Repair
- Mens & Womens Clothing, South Porcupine
- Mine Rescue, South Porcupine
- Mining, South Porcupine
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- Mining Contractors, South Porcupine - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, South Porcupine
- Mining Services, South Porcupine
- Mining, Crude-Oil Production, South Porcupine - Mining Companies
- Miscellaneous Government, South Porcupine
- Miscellaneous Manufacturing, South Porcupine
- Miscellaneous Personal Services, South Porcupine
- Miscellaneous Professional, South Porcupine
- Modular & Mobile Homes For Sale, South Porcupine - Manufactured Homes Sale & Service
- Modular Buildings, South Porcupine - Modular Homes Buildings & Offices
- Motion Picture Pre & Post Production Services, South Porcupine
- Motor Vehicle, South Porcupine
- Museums, South Porcupine
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