- Machinery, Supplies & Equipment - Business Production Related, Oak Ridges
- Machinery, Supplies & Equipment - Construction & Contractor Related, Oak Ridges
- Major Appliances, Oak Ridges - Household & Kitchen
- Management Consultants & Services, Oak Ridges
- Manicurists & Pedicurists, Oak Ridges
- Manufacturing, Oak Ridges
- Marriage & Family Counselors, Oak Ridges
- Martial Arts & Self Defense Schools, Oak Ridges
- Masonry Contractors, Oak Ridges - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Oak Ridges
- Massage Therapy, Oak Ridges
- Medical Alert Systems, Oak Ridges - Medical Alarms - PERS
- Medical Supplies & Equipment, Oak Ridges
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- Membership Sports & Recreation Clubs, Oak Ridges
- Mental Health Specialists, Oak Ridges - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Oak Ridges
- Miscellaneous Professional, Oak Ridges
- Moldings Materials, Oak Ridges
- Mortgage Bankers & Correspondents, Oak Ridges
- Mortgage Brokers, Oak Ridges
- Motor Vehicle, Oak Ridges
- Music, Oak Ridges
- Music Lessons, Oak Ridges
- Music Lessons - Instrumental, Oak Ridges
- Musical Instruments & Equipment Stores, Oak Ridges
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