- Machine Shop & Tool Repair Service, Dayton
- Machinery Movers & Erectors, Dayton
- Machinery, Supplies & Equipment - Business Production Related, Dayton
- Machinery, Supplies & Equipment - Business Supplies Related, Dayton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dayton
- Mailing, Delivery & Courier Service, Dayton
- Management Consultants & Services, Dayton
- Manicurists & Pedicurists, Dayton
- Manufacturing, Dayton
- Manufacturing Products, Dayton
- Martial Arts & Self Defense Schools, Dayton
- Masonry Materials & Supplies, Dayton
- Meat Market, Wholesale & Products, Dayton
- Men's & Boys Clothing & Accessories Stores, Dayton
- Mens & Boys Jeans & Western Wear Stores, Dayton
- Metal Buildings, Dayton - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Dayton - Iron Works
- Methodist Church, Dayton
- Mexican Restaurants, Dayton
- Millwork Manufacturers, Dayton
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- Mini & Self Storage, Dayton
- Mining, Dayton
- Ministries Church, Dayton
- Miscellaneous Business Services, Dayton
- Miscellaneous Government, Dayton
- Miscellaneous Professional, Dayton
- Mobile Home Parks & Communities , Dayton
- Modular & Mobile Homes For Sale, Dayton - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Dayton
- Mortgage Bankers & Correspondents, Dayton
- Mortgage Companies, Dayton
- Motor Vehicle, Dayton
- Motor Vehicle Rental & Leasing, Dayton
- Motorcycle Parts, Accessories & Dealers, Dayton
- Moving Companies, Dayton
- Moving Truck Rental , Dayton
- Muffler Shop & Exhaust Systems, Dayton
- Musical Instrument Rental, Dayton - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, Dayton
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