- Machine Shop & Tool Repair Service, Louisville
- Major Appliances, Louisville - Household & Kitchen
- Management Consultants & Services, Louisville
- Manifold Business Forms Manufacturers, Louisville
- Manufacturing, Louisville
- Manufacturing Products, Louisville
- Marinas & Marina Services, Louisville
- Marine Products And Services, Louisville
- Marine Services, Louisville
- Market Research & Analysis , Louisville - Market Analysis, Business & Economic Research
- Masonry Materials & Supplies, Louisville
- Membership Sports & Recreation Clubs, Louisville
- Mental Health Clinics, Louisville - Treatment Centers
- Mental Health Specialists, Louisville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Louisville
- Metal Coating & Allied Services, Louisville
- Metal Cutting Services, Louisville
- Metal Tanks, Louisville
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- Methodist Church, Louisville
- Mexican Restaurants, Louisville
- Military Supplies, Louisville
- Mini & Self Storage, Louisville
- Miscellaneous Agriculture, Louisville
- Miscellaneous Government, Louisville
- Miscellaneous Industry, Louisville
- Miscellaneous Manufacturing, Louisville
- Miscellaneous Personal Services, Louisville
- Mobile Home Parks & Communities , Louisville
- Modular & Mobile Homes For Sale, Louisville - Manufactured Homes Sale & Service
- Motion Picture & Television Production Services, Louisville
- Motion Picture Pre & Post Production Services, Louisville
- Motor Vehicle, Louisville
- Motor Vehicle Rental & Leasing, Louisville
- Motorcycle Parts, Accessories & Dealers, Louisville
- Movie Theaters, Louisville
- Moving Truck Rental , Louisville
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