- Mailbox Rental Services, Plymouth
- Mailing, Delivery & Courier Service, Plymouth
- Management Consultants & Services, Plymouth
- Manufacturing, Plymouth
- Masonry Materials & Supplies, Plymouth
- Medical & Health Service Organizations, Plymouth
- Meeting & Event Planning Services, Plymouth - Conference Consultants
- Mental Health Specialists, Plymouth - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Plymouth
- Miscellaneous Business Product Repair, Plymouth
- Miscellaneous Business Services, Plymouth
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- Miscellaneous Manufacturing, Plymouth
- Miscellaneous Professional, Plymouth
- Mortgage Bankers & Correspondents, Plymouth
- Mortgage Brokers, Plymouth
- Mortgage Companies, Plymouth
- Mortgage Feasibility Consultants, Plymouth
- Mortgages & Loans, Plymouth
- Motor Vehicle, Plymouth
- Motor Vehicle Rental & Leasing, Plymouth
- Moving & Storage Supplies & Equipment, Plymouth
- Moving Companies, Plymouth
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