- Machine Shop & Tool Repair Service, Wellsville
- Machine Tools , Wellsville
- Machinery, Supplies & Equipment - Business Production Related, Wellsville
- Machinery, Supplies & Equipment - Business Supplies Related, Wellsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wellsville
- Major Appliances, Wellsville - Household & Kitchen
- Management Consultants & Services, Wellsville
- Manufacturers Agents & Representatives, Wellsville
- Manufacturers Representative, Wellsville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Wellsville
- Marriage & Family Counselors, Wellsville
- Massage Therapists & Professional, Wellsville
- Massage Therapy, Wellsville
- Mausoleums Developers, Wellsville
- Medical Supplies & Equipment, Wellsville
- Membership Sports & Recreation Clubs, Wellsville
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- Mennonite Church, Wellsville
- Mental Health Specialists, Wellsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Wellsville
- Methodist Church, Wellsville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Wellsville
- Miscellaneous Government, Wellsville
- Miscellaneous Manufacturing, Wellsville
- Model Trains, Wellsville
- Monuments Cleaning, Wellsville
- Monuments, Tombstones, Markers & Memorials, Wellsville
- Motor Vehicle, Wellsville
- Motor Vehicle Rental & Leasing, Wellsville
- Movie Theaters, Wellsville
- Moving Truck Rental , Wellsville
- Music, Wellsville
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