- Mail Delivery Service, Maidsville
- Manufacturing, Maidsville
- Manufacturing Products, Maidsville
- Marine Supplies & Equipment, Maidsville - Boat Supplies
- Mining, Maidsville
- Mining Contractors, Maidsville - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Maidsville - Mining Companies
- Miscellaneous Business Services, Maidsville
- Mobile Home Contractors, Maidsville
- Mobile Home Improvements & Repairs, Maidsville
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- Mobile Home Parks & Communities , Maidsville
- Mobile Homes for Rent & Lease, Maidsville
- Motor Vehicle, Maidsville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Maidsville
- Motorcycle Repair & Service, Maidsville
- Music, Maidsville
- Music Entertainment, Maidsville
- Musical Recording Services, Maidsville
- Musicians, Bands & Disc Jockeys, Maidsville
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