- Machinery, Supplies & Equipment - Business Production Related, Centerport
- Mail Delivery Service, Centerport
- Maintenance, Cleaning & Sanitation, Centerport
- Management Consultants & Services, Centerport
- Manicurists & Pedicurists, Centerport
- Manufacturing, Centerport
- Marinas & Marina Services, Centerport
- Marriage & Family Counselors, Centerport
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- Martial Arts & Self Defense Schools, Centerport
- Membership Sports & Recreation Clubs, Centerport
- Mental Health Specialists, Centerport - Psychologist, Psychiatrist, Psychotherapist, etc
- Miscellaneous Government, Centerport
- Miscellaneous Professional, Centerport
- Motor Vehicle, Centerport
- Museums, Centerport
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