- Machine Shop & Tool Repair Service, Poquoson
- Machinery Repair & Rebuild, Poquoson
- Machinery, Supplies & Equipment - Business Production Related, Poquoson
- Mail Delivery Service, Poquoson
- Mailing, Delivery & Courier Service, Poquoson
- Management Consultants & Services, Poquoson
- Manicurists & Pedicurists, Poquoson
- Manufacturing, Poquoson
- Marinas & Marina Services, Poquoson
- Marine Contractors & Designers, Poquoson
- Martial Arts & Self Defense Schools, Poquoson
- Membership Sports & Recreation Clubs, Poquoson
- Mental Health Specialists, Poquoson - Psychologist, Psychiatrist, Psychotherapist, etc
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- Mental Retardation & Developmentally Disabled Services, Poquoson
- Methodist Church, Poquoson
- Mexican Restaurants, Poquoson
- Mining, Poquoson
- Miscellaneous Government, Poquoson
- Miscellaneous Photographers, Poquoson
- Miscellaneous Professional, Poquoson
- Mortgages & Loans, Poquoson
- Motor Vehicle, Poquoson
- Moving & Storage Supplies & Equipment, Poquoson
- Mulch, Peat & Moss Products, Poquoson
- Museums, Poquoson
- Musical Instruments Repair, Sales & Service, Poquoson
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