- Machine Shop & Tool Repair Service, Campbellford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Campbellford
- Major Appliances, Campbellford - Household & Kitchen
- Manufacturing, Campbellford
- Marine & Boat Products, Campbellford
- Masonry Materials & Supplies, Campbellford
- Massage Therapists & Professional, Campbellford
- Massage Therapy, Campbellford
- Medical Supplies & Equipment, Campbellford
- Membership Sports & Recreation Clubs, Campbellford
- Mens & Womens Clothing, Campbellford
- Mental Health Specialists, Campbellford - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Campbellford
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- Methodist Church, Campbellford
- Mini & Self Storage, Campbellford
- Miscellaneous Government, Campbellford
- Miscellaneous Industry, Campbellford
- Miscellaneous Personal Services, Campbellford
- Miscellaneous Professional, Campbellford
- Mission Churches, Campbellford
- Mortgage Bankers & Correspondents, Campbellford
- Mortgage Brokers, Campbellford
- Motor Vehicle, Campbellford
- Motor Vehicle Rental & Leasing, Campbellford
- Moving Truck Rental , Campbellford
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