- Machine Shop, Wingham
- Machine Shop & Tool Repair Service, Wingham
- Machinery, Supplies & Equipment - Business Supplies Related, Wingham
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wingham
- Major Appliances, Wingham - Household & Kitchen
- Manufacturing, Wingham
- Masonry Materials & Supplies, Wingham
- Massage Therapists & Professional, Wingham
- Massage Therapy, Wingham
- Membership Sports & Recreation Clubs, Wingham
- Mennonite Church, Wingham
- Mini & Self Storage, Wingham
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- Miscellaneous Business Services, Wingham
- Miscellaneous Government, Wingham
- Miscellaneous Personal Services, Wingham
- Miscellaneous Professional, Wingham
- Monuments, Tombstones, Markers & Memorials, Wingham
- Mortgage Bankers & Correspondents, Wingham
- Mortgage Brokers, Wingham
- Motor Vehicle, Wingham
- Motor Vehicle Rental & Leasing, Wingham
- Moving Truck Rental , Wingham
- Museums, Wingham
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