- Machine Shop, Prescott
- Machine Shop & Tool Repair Service, Prescott
- Machinery, Supplies & Equipment - Business Supplies Related, Prescott
- Machinery, Supplies & Equipment - Construction & Contractor Related, Prescott
- Major Appliances, Prescott - Household & Kitchen
- Manicurists & Pedicurists, Prescott
- Manufacturing, Prescott
- Manufacturing Products, Prescott
- Marinas & Marina Services, Prescott
- Masonry Contractors, Prescott - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Prescott
- Massage Therapy, Prescott
- Membership Sports & Recreation Clubs, Prescott
- Mens & Womens Clothing, Prescott
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- Mental Health Specialists, Prescott - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Prescott
- Miscellaneous Agriculture, Prescott
- Miscellaneous Government, Prescott
- Miscellaneous Personal Services, Prescott
- Miscellaneous Professional, Prescott
- Monuments, Tombstones, Markers & Memorials, Prescott
- Motor Vehicle, Prescott
- Motor Vehicle Rental & Leasing, Prescott
- Moving Companies, Prescott
- Moving Truck Rental , Prescott
- Music, Prescott
- Musical Instruments Repair, Sales & Service, Prescott
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