- Machine Shop, Prineville
- Machine Shop & Tool Repair Service, Prineville
- Machinery Repair & Rebuild, Prineville
- Machinery, Supplies & Equipment - Business Production Related, Prineville
- Machinery, Supplies & Equipment - Business Supplies Related, Prineville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Prineville
- Mailing, Delivery & Courier Service, Prineville
- Maintenance, Cleaning & Sanitation, Prineville
- Major Appliances, Prineville - Household & Kitchen
- Management Consultants & Services, Prineville
- Manicurists & Pedicurists, Prineville
- Manufacturing, Prineville
- Manufacturing Products, Prineville
- Masonry Materials & Supplies, Prineville
- Meat Cutting Services, Prineville
- Meat Market, Wholesale & Products, Prineville
- Medical Supplies & Equipment, Prineville
- Men's & Boys Clothing & Accessories Stores, Prineville
- Mens & Boys Jeans & Western Wear Stores, Prineville
- Mexican Restaurants, Prineville
- Millwork Contractors, Prineville
- Mini & Self Storage, Prineville
- Mining, Prineville
- Miscellaneous Household Item Repair, Prineville
- Miscellaneous Retail Stores, Prineville
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- Miscellaneous Agriculture, Prineville
- Miscellaneous Government, Prineville
- Miscellaneous Industry, Prineville
- Miscellaneous Personal Services, Prineville
- Miscellaneous Photographers, Prineville
- Miscellaneous Professional, Prineville
- Mobile Home Parks & Communities , Prineville
- Modular & Mobile Homes For Sale, Prineville - Manufactured Homes Sale & Service
- Moldings Materials, Prineville
- Monuments, Tombstones, Markers & Memorials, Prineville
- Mortgage Companies, Prineville
- Mortgages & Loans, Prineville
- Mosquito Control, Prineville
- Motor Vehicle, Prineville
- Motor Vehicle Rental & Leasing, Prineville
- Motorcycle & ATV Repair & Service, Prineville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Prineville
- Motorcycle Repair & Service, Prineville
- Movie Theaters, Prineville
- Moving Truck Rental , Prineville
- Muffler Shop & Exhaust Systems, Prineville
- Museums, Prineville
- Music, Prineville
- Musical Instruments Repair, Sales & Service, Prineville
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