- Machinery, Supplies & Equipment - Business Production Related, Barbourville
- Machinery, Supplies & Equipment - Business Supplies Related, Barbourville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Barbourville
- Mail Delivery Service, Barbourville
- Major Appliances, Barbourville - Household & Kitchen
- Management Consultants & Services, Barbourville
- Manicurists & Pedicurists, Barbourville
- Manufacturing, Barbourville
- Masonry Materials & Supplies, Barbourville
- Medical Billing Services, Barbourville
- Mental Health Specialists, Barbourville - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Barbourville
- Methodist Church, Barbourville
- Mexican Restaurants, Barbourville
- Mini & Self Storage, Barbourville
- Mining, Barbourville
- Mining Contractors, Barbourville - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Barbourville
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- Mining Equipment & Supplies Service & Repair, Barbourville
- Mining, Crude-Oil Production, Barbourville - Mining Companies
- Miscellaneous Business Services, Barbourville
- Miscellaneous Government, Barbourville
- Miscellaneous Industry, Barbourville
- Miscellaneous Photographers, Barbourville
- Miscellaneous Professional, Barbourville
- Mission Churches, Barbourville
- Mobile Home Parks & Communities , Barbourville
- Monuments, Tombstones, Markers & Memorials, Barbourville
- Motor Vehicle, Barbourville
- Motor Vehicle Rental & Leasing, Barbourville
- Motorcycle & ATV Repair & Service, Barbourville
- Motorcycle Repair & Service, Barbourville
- Moving Truck Rental , Barbourville
- Museums, Barbourville
- Music, Barbourville
- Musical Recording Services, Barbourville
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