- Machine Shop & Tool Repair Service, Covington
- Machinery And Equipment Manufacturers, Covington
- Machinery, Supplies & Equipment - Business Production Related, Covington
- Machinery, Supplies & Equipment - Business Supplies Related, Covington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Covington
- Major Appliances, Covington - Household & Kitchen
- Management Consultants & Services, Covington
- Manicurists & Pedicurists, Covington
- Manufacturing, Covington
- Manufacturing Products, Covington
- Marble, Covington
- Marble Tile, Covington
- Marriage & Family Counselors, Covington
- Martial Arts & Self Defense Schools, Covington
- Masonry Materials & Supplies, Covington
- Medical Supplies & Equipment, Covington
- Mental Health Clinics, Covington - Treatment Centers
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- Merle Norman Cosmetics, Covington
- Methodist Church, Covington
- Mexican Restaurants, Covington
- Miscellaneous Business Services, Covington
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Covington
- Miscellaneous Government, Covington
- Miscellaneous Industry, Covington
- Miscellaneous Personal Services, Covington
- Miscellaneous Professional, Covington
- Monuments, Tombstones, Markers & Memorials, Covington
- Mortgage Bankers & Correspondents, Covington
- Mortgage Companies, Covington
- Motor Vehicle, Covington
- Motor Vehicle Rental & Leasing, Covington
- Moving Truck Rental , Covington
- Muffler Shop & Exhaust Systems, Covington
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