- Machine Shop, Catlettsburg
- Machine Shop & Tool Repair Service, Catlettsburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Catlettsburg
- Mailing, Delivery & Courier Service, Catlettsburg
- Management Consultants & Services, Catlettsburg
- Manufacturing, Catlettsburg
- Manufacturing Products, Catlettsburg
- Marine Contractors & Designers, Catlettsburg
- Meat Market, Wholesale & Products, Catlettsburg
- Medical Supplies & Equipment, Catlettsburg
- Mental Health Specialists, Catlettsburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Goods Alloys, Catlettsburg
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- Methodist Church, Catlettsburg
- Mini & Self Storage, Catlettsburg
- Mining, Catlettsburg
- Mining Contractors, Catlettsburg - Mining Companies, Contractors & Brokers
- Mining Services, Catlettsburg
- Mining, Crude-Oil Production, Catlettsburg - Mining Companies
- Miscellaneous Government, Catlettsburg
- Miscellaneous Professional, Catlettsburg
- Motor Vehicle, Catlettsburg
- Motor Vehicle Rental & Leasing, Catlettsburg
- Music Entertainment, Catlettsburg
- Musical Instrument Rental, Catlettsburg - Band & Orchestra Instruments
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