- Machine Shop & Tool Repair Service, Mayfield
- Machinery, Supplies & Equipment - Business Production Related, Mayfield
- Machinery, Supplies & Equipment - Business Supplies Related, Mayfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mayfield
- Maintenance, Cleaning & Sanitation, Mayfield
- Management Consultants & Services, Mayfield
- Manicurists & Pedicurists, Mayfield
- Manufacturing, Mayfield
- Manufacturing Products, Mayfield
- Marriage & Family Counselors, Mayfield
- Masonry Contractors, Mayfield - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Mayfield
- Mausoleums Developers, Mayfield
- Meat Market, Wholesale & Products, Mayfield
- Meat Packers, Mayfield
- Mechanical Contractors, Mayfield - Install, Service & Repair
- Medical Alert Systems, Mayfield - Medical Alarms - PERS
- Medical Supplies & Equipment, Mayfield
- Membership Sports & Recreation Clubs, Mayfield
- Men's Clothing Stores, Mayfield - Clothes & Accessories
- Mental Health Clinics, Mayfield - Treatment Centers
- Mental Health Specialists, Mayfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Mayfield
- Merchandise Sales Events, Mayfield
- Metal Buildings, Mayfield - Kits, Homes, Steel Buildings, etc
- Metal Finishers, Mayfield
- Metal Plating & Polishing, Mayfield
- Metal Products, Mayfield
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- Methodist Church, Mayfield
- Mexican Restaurants, Mayfield
- Midwives, Mayfield
- Mildew Removal & Control, Mayfield - Mold Removal
- Ministries Church, Mayfield
- Mirrors, Mayfield - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Government, Mayfield
- Miscellaneous Industry, Mayfield
- Miscellaneous Personal Services, Mayfield
- Miscellaneous Photographers, Mayfield
- Miscellaneous Professional, Mayfield
- Mobile Home Parks & Communities , Mayfield
- Monuments, Tombstones, Markers & Memorials, Mayfield
- Mortgage Bankers & Correspondents, Mayfield
- Mortgage Brokers, Mayfield
- Mortgage Companies, Mayfield
- Mortgage Feasibility Consultants, Mayfield
- Mortgages & Loans, Mayfield
- Motor Vehicle, Mayfield
- Motor Vehicle Rental & Leasing, Mayfield
- Motorcycle & Motor Scooters Dealers, Repair & Service, Mayfield
- Motorcycle Parts, Accessories & Dealers, Mayfield
- Motorcycle Repair & Service, Mayfield
- Movie Theaters, Mayfield
- Moving Companies, Mayfield
- Moving Services - Labor & Material, Mayfield
- Moving Truck Rental , Mayfield
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