- Machine Shop & Tool Repair Service, Princeville
- Machinery Repair & Rebuild, Princeville
- Machinery, Supplies & Equipment - Business Production Related, Princeville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Princeville
- Manufacturing, Princeville
- Manufacturing Equipment & Supplies, Princeville
- Manufacturing Products, Princeville
- Maple Sugar Manufacturers Supplies, Princeville
- Marine & Boat Products, Princeville
- Marine Supplies & Equipment, Princeville - Boat Supplies
- Masonry Materials & Supplies, Princeville
- Massage Therapy, Princeville
- Medical Supplies & Equipment, Princeville
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- Metal Plating & Polishing, Princeville
- Metal Polishing & Buffing, Princeville
- Metallurgical Testing Labs, Princeville
- Mining, Princeville
- Miscellaneous Agriculture, Princeville
- Mobile Restaurants, Princeville
- Motor Vehicle, Princeville
- Motor Vehicle Rental & Leasing, Princeville
- Motorcycle Parts, Accessories & Dealers, Princeville
- Moving Truck Rental , Princeville
- Music, Princeville
- Musical Instrument Manufacturers, Princeville
- Musical Instruments & Equipment Stores, Princeville
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