- Machine Shop & Tool Repair Service, Covington
- Machinery, Supplies & Equipment - Business Supplies Related, Covington
- Mail Delivery Service, Covington
- Major Appliances, Covington - Household & Kitchen
- Management Consultants & Services, Covington
- Manicurists & Pedicurists, Covington
- Manufacturing, Covington
- Manufacturing Products, Covington
- Marriage & Family Counselors, Covington
- Masonry Materials & Supplies, Covington
- Medical & Dental Management, Covington
- Medical Management & Business Administration Service, Covington
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- Metal Stampings Manufacturers, Covington
- Methodist Church, Covington
- Mini & Self Storage, Covington
- Miscellaneous Government, Covington
- Miscellaneous Metal Work Manufacturers, Covington
- Miscellaneous Personal Services, Covington
- Miscellaneous Professional, Covington
- Monuments, Tombstones, Markers & Memorials, Covington
- Motor Vehicle, Covington
- Motor Vehicle Rental & Leasing, Covington
- Motorcycle Parts, Accessories & Dealers, Covington
- Moving Truck Rental , Covington
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