- Machine Shop & Tool Repair Service, Ortonville
- Machine Tool Repair & Rebuild, Ortonville
- Machinery, Supplies & Equipment - Business Production Related, Ortonville
- Maintenance, Cleaning & Sanitation, Ortonville
- Management Consultants & Services, Ortonville
- Manicurists & Pedicurists, Ortonville
- Manufacturing, Ortonville
- Manufacturing Products, Ortonville
- Marine Products And Services, Ortonville
- Marine Repair & Service Stations, Ortonville
- Marine Supplies & Equipment, Ortonville - Boat Supplies
- Marine Supplies & Equipment Repair, Ortonville - Boat Supplies & Equipment
- Martial Arts & Self Defense Schools, Ortonville
- Masonry Materials & Supplies, Ortonville
- Massage Therapists & Professional, Ortonville
- Massage Therapy, Ortonville
- Mastectomy Apparel, Forms, Prostheses & Supplies, Ortonville
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- Medical Billing Services, Ortonville
- Medical Records Service , Ortonville
- Medical Supplies & Equipment, Ortonville
- Mental Health Clinics, Ortonville - Treatment Centers
- Methodist Church, Ortonville
- Mexican Restaurants, Ortonville
- Miscellaneous Agriculture, Ortonville
- Miscellaneous Government, Ortonville
- Miscellaneous Manufacturing, Ortonville
- Miscellaneous Personal Services, Ortonville
- Miscellaneous Professional, Ortonville
- Mortgage Bankers & Correspondents, Ortonville
- Motor Vehicle, Ortonville
- Motor Vehicle Rental & Leasing, Ortonville
- Motorcycle & ATV Repair & Service, Ortonville
- Motorcycle Repair & Service, Ortonville
- Museums, Ortonville
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