| | Ohio County | WV | 54069 | | Wheeling, WV-OH 48540 | | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=OhioCounty+WV |
| | Nicholas County | WV | 54067 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=NicholasCounty+WV |
| | Morgan County | WV | 54065 | | Hagerstown-Martinsburg,
MD-WV 25180 | Washington-Baltimore-Arlington,
DC-MD-VA-WV-PA 548 | Outlying | nonmetro county (rural) | recreation | https://maps.google.com/?q=MorganCounty+WV |
| | Monroe County | WV | 54063 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=MonroeCounty+WV |
| | Monongalia County | WV | 54061 | | Morgantown, WV 34060 | | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=MonongaliaCounty+WestVirginia |
| | Mingo County | WV | 54059 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=MingoCounty+WV |
| | Mineral County | WV | 54057 | | Cumberland, MD-WV 19060 | | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=MineralCounty+WV |
| | Mercer County | WV | 54055 | | Bluefield, WV-VA 14140 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MercerCounty+WV |
| | McDowell County | WV | 54047 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=McDowellCounty+WV |
| | Mason County | WV | 54053 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MasonCounty+WestVirginia |