- Machine Shop, Covington
- Machine Shop & Tool Repair Service, Covington
- Machinery, Supplies & Equipment - Business Supplies Related, Covington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Covington
- Management Consultants & Services, Covington
- Manicurists & Pedicurists, Covington
- Manufacturing, Covington
- Manufacturing Products, Covington
- Manufacturing Services, Covington
- Marriage & Family Counselors, Covington
- Martial Arts & Self Defense Schools, Covington
- Masonry Materials & Supplies, Covington
- Meat Market, Wholesale & Products, Covington
- Medical Supplies & Equipment, Covington
- Mental Health Specialists, Covington - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Covington
- Merle Norman Cosmetics, Covington
- Metal Specialties, Covington
- Millwork Contractors, Covington
- Miscellaneous Household Item Repair, Covington
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- Miscellaneous Government, Covington
- Miscellaneous Industry, Covington
- Miscellaneous Personal Services, Covington
- Miscellaneous Photographers, Covington
- Miscellaneous Professional, Covington
- Modular & Mobile Homes For Sale, Covington - Manufactured Homes Sale & Service
- Money Counting & Wrapping, Covington
- Monuments, Tombstones, Markers & Memorials, Covington
- Mortgage Bankers & Correspondents, Covington
- Mortgages & Loans, Covington
- Motor Vehicle, Covington
- Motor Vehicle Rental & Leasing, Covington
- Motorcycle Parts, Accessories & Dealers, Covington
- Moving Companies, Covington
- Moving Supplies & Equipment Rental, Covington
- Moving Truck Rental , Covington
- Muffler Shop & Exhaust Systems, Covington
- Music, Covington
- Musical Instrument Rental, Covington - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Covington
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