- Machine Shop & Tool Repair Service, Claysville
- Machine Shop Rotary Surface Grinding, Claysville - Tool Grinding & Sharpening
- Machinery, Supplies & Equipment - Business Production Related, Claysville
- Major Appliances, Claysville - Household & Kitchen
- Management Consultants & Services, Claysville
- Manufacturing, Claysville
- Manufacturing Products, Claysville
- Meat Packers, Claysville
- Medical Diagnostic Clinics, Claysville - Clinical Labs & Centers
- Medical Supplies & Equipment, Claysville
- Methodist Church, Claysville
- Mine Shaft Contractors, Claysville
- Mining, Claysville
- Mining Contractors, Claysville - Mining Companies, Contractors & Brokers
- Mining Development & Exploration, Claysville
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- Mining Services, Claysville
- Mining, Crude-Oil Production, Claysville - Mining Companies
- Miscellaneous Government, Claysville
- Miscellaneous Personal Services, Claysville
- Mobile Home Contractors, Claysville
- Mobile Home Improvements & Repairs, Claysville
- Modular & Mobile Homes For Sale, Claysville - Manufactured Homes Sale & Service
- Motor Vehicle, Claysville
- Motor Vehicle Rental & Leasing, Claysville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Claysville
- Motorcycle Parts & Equipment, Claysville
- Motorcycle Parts, Accessories & Dealers, Claysville
- Motorcycle Performance Racing Equipment & Service, Claysville
- Motorcycle Repair & Service, Claysville
- Moving Truck Rental , Claysville
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