- Machine Shop & Tool Repair Service, Poplarville
- Machinery, Supplies & Equipment - Business Production Related, Poplarville
- Machinery, Supplies & Equipment - Business Supplies Related, Poplarville
- Management Consultants & Services, Poplarville
- Manicurists & Pedicurists, Poplarville
- Manufacturing, Poplarville
- Manufacturing Products, Poplarville
- Masonry Materials & Supplies, Poplarville
- Meat Packers, Poplarville
- Mental Health Clinics, Poplarville - Treatment Centers
- Methodist Church, Poplarville
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- Mexican Restaurants, Poplarville
- Miscellaneous Business Services, Poplarville
- Miscellaneous Government, Poplarville
- Miscellaneous Professional, Poplarville
- Money Counting & Wrapping, Poplarville
- Mortgage Bankers & Correspondents, Poplarville
- Motor Vehicle, Poplarville
- Motor Vehicle Rental & Leasing, Poplarville
- Moving Truck Rental , Poplarville
- Mulch, Peat & Moss Products, Poplarville
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