- Machine Shop & Tool Repair Service, Dayton
- Machinery, Supplies & Equipment - Business Production Related, Dayton
- Machinery, Supplies & Equipment - Business Supplies Related, Dayton
- Mail Delivery Service, Dayton
- Mailing, Delivery & Courier Service, Dayton
- Management Consultants & Services, Dayton
- Manicurists & Pedicurists, Dayton
- Manufacturing, Dayton
- Manufacturing & Industrial Consultants, Dayton
- Manufacturing Products, Dayton
- Manufacturing Services, Dayton
- Marriage & Family Counselors, Dayton
- Martial Arts & Self Defense Schools, Dayton
- Meat Market, Wholesale & Products, Dayton
- Mechanical Contractors, Dayton - Install, Service & Repair
- Medical & Health Service Organizations, Dayton
- Medical Equipment Manufacturers, Dayton
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- Medical Products & Equipment, Dayton
- Membership Sports & Recreation Clubs, Dayton
- Men's & Boys Clothing & Accessories Stores, Dayton
- Mens & Boys Belts & Suspenders, Dayton
- Metal Specialties, Dayton
- Meteorologists, Dayton
- Middle Eastern Restaurants, Dayton
- Mining, Dayton
- Miscellaneous Business Services, Dayton
- Miscellaneous Government, Dayton
- Miscellaneous Personal Services, Dayton
- Miscellaneous Professional, Dayton
- Motor Vehicle, Dayton
- Motor Vehicle Rental & Leasing, Dayton
- Moving Companies, Dayton
- Moving Truck Rental , Dayton
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