- Machine Shop & Tool Repair Service, David City
- Machinery Movers & Erectors, David City
- Machinery, Supplies & Equipment - Business Production Related, David City
- Machinery, Supplies & Equipment - Business Supplies Related, David City
- Machinery, Supplies & Equipment - Construction & Contractor Related, David City
- Manufacturing, David City
- Manufacturing Products, David City
- Masonry Materials & Supplies, David City
- Membership Sports & Recreation Clubs, David City
- Men's Clothing Stores, David City - Clothes & Accessories
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- Mental Health Specialists, David City - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, David City
- Mexican Restaurants, David City
- Miscellaneous Government, David City
- Miscellaneous Professional, David City
- Mortgage Bankers & Correspondents, David City
- Mortgages & Loans, David City
- Motor Vehicle, David City
- Museums, David City
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