- Machine Shop, Louisville
- Machine Shop & Tool Repair Service, Louisville
- Machinery, Supplies & Equipment - Business Production Related, Louisville
- Machinery, Supplies & Equipment - Business Supplies Related, Louisville
- Major Appliances, Louisville - Household & Kitchen
- Management Consultants & Services, Louisville
- Manicurists & Pedicurists, Louisville
- Manufacturing, Louisville
- Manufacturing Equipment & Supplies, Louisville
- Manufacturing Products, Louisville
- Marriage & Family Counselors, Louisville
- Masonry Materials & Supplies, Louisville
- Medical & Dental Management, Louisville
- Medical Supplies & Equipment, Louisville
- Men's Clothing Stores, Louisville - Clothes & Accessories
- Mental Health Clinics, Louisville - Treatment Centers
- Mental Health Specialists, Louisville - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Louisville
- Merle Norman Cosmetics, Louisville
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- Methodist Church, Louisville
- Mexican Restaurants, Louisville
- Mining, Louisville
- Miscellaneous Government, Louisville
- Miscellaneous Personal Services, Louisville
- Miscellaneous Professional, Louisville
- Mission Churches, Louisville
- Monuments, Tombstones, Markers & Memorials, Louisville
- Mortgage Bankers & Correspondents, Louisville
- Motion Picture Pre & Post Production Services, Louisville
- Motor Vehicle, Louisville
- Motor Vehicle Rental & Leasing, Louisville
- Motorcycle & ATV Repair & Service, Louisville
- Motorcycle Repair & Service, Louisville
- Movie Theaters, Louisville
- Moving Truck Rental , Louisville
- Muffler Shop & Exhaust Systems, Louisville
- Musical Instruments Repair, Sales & Service, Louisville
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