- Machine Shop, Madisonville
- Machine Shop & Tool Repair Service, Madisonville
- Machinery And Equipment Manufacturers, Madisonville
- Machinery, Supplies & Equipment - Business Production Related, Madisonville
- Machinery, Supplies & Equipment - Business Supplies Related, Madisonville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Madisonville
- Management Consultants & Services, Madisonville
- Manicurists & Pedicurists, Madisonville
- Manufacturers Agents & Representatives, Madisonville
- Manufacturers Representative, Madisonville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Madisonville
- Manufacturing Products, Madisonville
- Marriage & Family Counselors, Madisonville
- Martial Arts & Self Defense Schools, Madisonville
- Masonry Materials & Supplies, Madisonville
- Material Handling Equipment, Madisonville - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Madisonville
- Medical & Health Service Organizations, Madisonville
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Madisonville
- Medical Groups & Clinics, Madisonville - Medical & Health Centers
- Medical Supplies & Equipment, Madisonville
- Men's Clothing Stores, Madisonville - Clothes & Accessories
- Mental Health Clinics, Madisonville - Treatment Centers
- Mental Health Specialists, Madisonville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Madisonville
- Metal Plating & Polishing, Madisonville
- Methodist Church, Madisonville
- Mexican Restaurants, Madisonville
- Mini & Self Storage, Madisonville
- Mining, Madisonville
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- Mining Contractors, Madisonville - Mining Companies, Contractors & Brokers
- Mining Development & Exploration, Madisonville
- Mining Equipment & Supplies, Madisonville
- Mining Services, Madisonville
- Mining, Crude-Oil Production, Madisonville - Mining Companies
- Ministries Church, Madisonville
- Miscellaneous Business Services, Madisonville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Madisonville
- Miscellaneous Government, Madisonville
- Miscellaneous Industry, Madisonville
- Miscellaneous Manufacturing, Madisonville
- Miscellaneous Personal Services, Madisonville
- Miscellaneous Photographers, Madisonville
- Miscellaneous Professional, Madisonville
- Mobile Home Parks & Communities , Madisonville
- Monuments, Tombstones, Markers & Memorials, Madisonville
- Mortgage Bankers & Correspondents, Madisonville
- Mortgages & Loans, Madisonville
- Motor Vehicle, Madisonville
- Motor Vehicle Rental & Leasing, Madisonville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Madisonville
- Motorcycle Parts, Accessories & Dealers, Madisonville
- Motorcycle Repair & Service, Madisonville
- Movie Theaters, Madisonville
- Moving Companies, Madisonville
- Moving Truck Rental , Madisonville
- Mulch, Peat & Moss Products, Madisonville
- Museums, Madisonville
- Music, Madisonville
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