- Machine Shop, Listowel
- Machine Shop & Tool Repair Service, Listowel
- Machinery, Supplies & Equipment - Business Supplies Related, Listowel
- Machinery, Supplies & Equipment - Construction & Contractor Related, Listowel
- Manicurists & Pedicurists, Listowel
- Manufacturing, Listowel
- Manufacturing Products, Listowel
- Marriage & Family Counselors, Listowel
- Masonry Materials & Supplies, Listowel
- Massage Therapists & Professional, Listowel
- Massage Therapy, Listowel
- Maternity Clothes & Clothing Stores, Listowel - Maternity Dress, Gown, Swimwear, Underwear & More
- Medical Supplies & Equipment, Listowel
- Membership Sports & Recreation Clubs, Listowel
- Men's Clothing Stores, Listowel - Clothes & Accessories
- Mennonite Church, Listowel
- Mens & Womens Clothing, Listowel
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- Mental Health Specialists, Listowel - Psychologist, Psychiatrist, Psychotherapist, etc
- Millwrights, Listowel
- Mini & Self Storage, Listowel
- Mini Golf Courses, Listowel
- Miscellaneous Agriculture, Listowel
- Miscellaneous Government, Listowel
- Miscellaneous Industry, Listowel
- Miscellaneous Personal Services, Listowel
- Miscellaneous Professional, Listowel
- Monuments, Tombstones, Markers & Memorials, Listowel
- Mortgage Bankers & Correspondents, Listowel
- Motor Vehicle, Listowel
- Motor Vehicle Rental & Leasing, Listowel
- Movie Theaters, Listowel
- Moving Truck Rental , Listowel
- Music, Listowel
- Musical Instruments & Equipment Stores, Listowel
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