- Machine Shop & Tool Repair Service, Peterborough
- Machine Tools , Peterborough
- Machinery, Supplies & Equipment - Business Production Related, Peterborough
- Machinery, Supplies & Equipment - Business Supplies Related, Peterborough
- Machinery, Supplies & Equipment - Construction & Contractor Related, Peterborough
- Magazine & Newspaper Stands, Peterborough - Dealers & Distributors
- Management Consultants & Services, Peterborough
- Manicurists & Pedicurists, Peterborough
- Manufacturing, Peterborough
- Manufacturing & Industrial Consultants, Peterborough
- Market Research & Analysis , Peterborough - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Peterborough
- Marriage & Family Counselors, Peterborough
- Masonry Materials & Supplies, Peterborough
- Massage Therapists & Professional, Peterborough
- Massage Therapy, Peterborough
- Mechanical Engineer, Peterborough - Mechanical Engineering Service
- Medical Equipment Manufacturers, Peterborough
- Membership Sports & Recreation Clubs, Peterborough
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- Mental Health Specialists, Peterborough - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Peterborough
- Metaphysical Churches, Peterborough
- Methodist Church, Peterborough
- Miscellaneous Household Item Repair, Peterborough
- Miscellaneous Business Services, Peterborough
- Miscellaneous Government, Peterborough
- Miscellaneous Manufacturing, Peterborough
- Miscellaneous Professional, Peterborough
- Monuments, Tombstones, Markers & Memorials, Peterborough
- Motion Picture Pre & Post Production Services, Peterborough
- Motion Pictures Video Tape Duplication & Transfer Services, Peterborough
- Motor Vehicle, Peterborough
- Motor Vehicle Rental & Leasing, Peterborough
- Moving Companies, Peterborough
- Moving Truck Rental , Peterborough
- Museums, Peterborough
- Music, Peterborough
- Musical Instruments & Equipment Stores, Peterborough
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