- Machine Shop & Tool Repair Service, Mount Ayr
- Machinery, Supplies & Equipment - Business Supplies Related, Mount Ayr
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mount Ayr
- Mail Delivery Service, Mount Ayr
- Major Appliances, Mount Ayr - Household & Kitchen
- Management Consultants & Services, Mount Ayr
- Manufacturing, Mount Ayr
- Marriage & Family Counselors, Mount Ayr
- Masonry Materials & Supplies, Mount Ayr
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- Meat Market, Wholesale & Products, Mount Ayr
- Medical Supplies & Equipment, Mount Ayr
- Membership Sports & Recreation Clubs, Mount Ayr
- Methodist Church, Mount Ayr
- Miscellaneous Government, Mount Ayr
- Miscellaneous Professional, Mount Ayr
- Mortgage Bankers & Correspondents, Mount Ayr
- Mortgages & Loans, Mount Ayr
- Motor Vehicle, Mount Ayr
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