- Machine Shop & Tool Repair Service, Wellsville
- Machinery Movers & Erectors, Wellsville
- Machinery, Supplies & Equipment - Business Production Related, Wellsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wellsville
- Magazine & Newspaper Stands, Wellsville - Dealers & Distributors
- Manufacturing, Wellsville
- Manufacturing Products, Wellsville
- Marinas & Marina Services, Wellsville
- Mechanical Contractors, Wellsville - Install, Service & Repair
- Merchandise Sales Events, Wellsville
- Metal Working Machinery, Wellsville
- Methodist Church, Wellsville
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- Minerals, Wellsville
- Mini & Self Storage, Wellsville
- Miscellaneous Agriculture, Wellsville
- Miscellaneous Government, Wellsville
- Miscellaneous Manufacturing, Wellsville
- Miscellaneous Personal Services, Wellsville
- Motor Vehicle, Wellsville
- Motor Vehicle Rental & Leasing, Wellsville
- Moving Truck Rental , Wellsville
- Muffler Shop & Exhaust Systems, Wellsville
- Museums, Wellsville
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