- Machine Shop, Linn
- Machinery, Supplies & Equipment - Business Supplies Related, Linn
- Machinery, Supplies & Equipment - Construction & Contractor Related, Linn
- Management Consultants & Services, Linn
- Manufacturing, Linn
- Masonry Materials & Supplies, Linn
- Meat Market, Wholesale & Products, Linn
- Medical & Dental Management, Linn
- Membership Sports & Recreation Clubs, Linn
- Mental Health Specialists, Linn - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Linn
- Methodist Church, Linn
- Mining, Linn
- Mining Contractors, Linn - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Linn - Mining Companies
- Miscellaneous Government, Linn
- Miscellaneous Photographers, Linn
- Miscellaneous Professional, Linn
- Moldings Materials, Linn
- Motor Vehicle, Linn
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