- Machine Shop & Tool Repair Service, Maineville
- Machinery, Supplies & Equipment - Business Production Related, Maineville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Maineville
- Mail Delivery Service, Maineville
- Mailbox Rental Services, Maineville
- Mailing, Delivery & Courier Service, Maineville
- Malls & Shopping Centers, Maineville
- Management Consultants & Services, Maineville
- Manicurists & Pedicurists, Maineville
- Manufacturers Agents & Representatives, Maineville
- Manufacturers Representative, Maineville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Maineville
- Marketing Schools, Maineville
- Martial Arts & Self Defense Schools, Maineville
- Massage Therapists & Professional, Maineville
- Massage Therapy, Maineville
- Mechanical Contractors, Maineville - Install, Service & Repair
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Maineville
- Medical Supplies & Equipment, Maineville
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- Meeting & Event Planning Services, Maineville - Conference Consultants
- Membership Sports & Recreation Clubs, Maineville
- Mental Health Specialists, Maineville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Maineville
- Mexican Restaurants, Maineville
- Miscellaneous Government, Maineville
- Miscellaneous Manufacturing, Maineville
- Miscellaneous Personal Services, Maineville
- Miscellaneous Photographers, Maineville
- Miscellaneous Professional, Maineville
- Mortgage Bankers & Correspondents, Maineville
- Motor Vehicle, Maineville
- Motor Vehicle Rental & Leasing, Maineville
- Moving & Storage Supplies & Equipment, Maineville
- Moving Supplies & Equipment Rental, Maineville
- Moving Truck Rental , Maineville
- Mulch, Peat & Moss Products, Maineville
- Music, Maineville
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