- Machine Shop & Tool Repair Service, Jamestown
- Machinery, Supplies & Equipment - Business Production Related, Jamestown
- Mail Delivery Service, Jamestown
- Mailing, Delivery & Courier Service, Jamestown
- Management Consultants & Services, Jamestown
- Manufacturing, Jamestown
- Masonry Contractors, Jamestown - Stone Mason, Brick Mason - Install & Repair
- Medical Alert Systems, Jamestown - Medical Alarms - PERS
- Medical Supplies & Equipment, Jamestown
- Methodist Church, Jamestown
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- Miscellaneous Government, Jamestown
- Miscellaneous Manufacturing, Jamestown
- Miscellaneous Photographers, Jamestown
- Mission Churches, Jamestown
- Money Transfer Service, Jamestown
- Mortgage Bankers & Correspondents, Jamestown
- Mortgage Companies, Jamestown
- Mortgage Contracts & Services, Jamestown
- Motor Vehicle, Jamestown
- Motorcycles Bicycles & Parts, Jamestown
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