- Machinery, Supplies & Equipment - Construction & Contractor Related, Saltsburg
- Management Consultants & Services, Saltsburg
- Manufacturing, Saltsburg
- Manufacturing Products, Saltsburg
- Medical Supplies & Equipment, Saltsburg
- Metal Coating & Allied Services, Saltsburg
- Metal Cutting Services, Saltsburg
- Methodist Church, Saltsburg
- Mining, Saltsburg
- Mining Contractors, Saltsburg - Mining Companies, Contractors & Brokers
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- Mining, Crude-Oil Production, Saltsburg - Mining Companies
- Miscellaneous Government, Saltsburg
- Miscellaneous Industry, Saltsburg
- Miscellaneous Manufacturing, Saltsburg
- Miscellaneous Professional, Saltsburg
- Mobile Automobile Services, Saltsburg
- Motor Vehicle, Saltsburg
- Motor Vehicle Rental & Leasing, Saltsburg
- Moving Truck Rental , Saltsburg
- Museums, Saltsburg
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