- Machine Shop & Tool Repair Service, Postville
- Major Appliances, Postville - Household & Kitchen
- Management Consultants & Services, Postville
- Manufacturing, Postville
- Marionettes & Puppets, Postville
- Masonry Materials & Supplies, Postville
- Meat Market, Wholesale & Products, Postville
- Meat Packers, Postville
- Mental Health Specialists, Postville - Psychologist, Psychiatrist, Psychotherapist, etc
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