- Machine Shop & Tool Repair Service, Dayton
- Machinery, Supplies & Equipment - Business Production Related, Dayton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dayton
- Mailing, Delivery & Courier Service, Dayton
- Manufacturing, Dayton
- Marriage & Family Counselors, Dayton
- Masonry Materials & Supplies, Dayton
- Meat Cutting Services, Dayton
- Meat Market, Wholesale & Products, Dayton
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- Mental Health Specialists, Dayton - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Dayton
- Mexican Restaurants, Dayton
- Miscellaneous Government, Dayton
- Mortgages & Loans, Dayton
- Motor Vehicle, Dayton
- Motor Vehicle Rental & Leasing, Dayton
- Moving Truck Rental , Dayton
- Museums, Dayton
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