| | Oregon County | MO | 29149 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=OregonCounty+MO |
| | Nodaway County | MO | 29147 | | Maryville, MO 32340 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=NodawayCounty+MO |
| | Newton County | MO | 29145 | | Joplin, MO-KS 27900 | Joplin-Miami, MO-OK-KS 309 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=NewtonCounty+MO |
| | New Madrid County | MO | 29143 | | | | | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=NewMadridCounty+MO |
| | Morgan County | MO | 29141 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=MorganCounty+MO |
| | Montgomery County | MO | 29139 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MontgomeryCounty+MO |
| | Monroe County | MO | 29137 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=MonroeCounty+MO |
| | Moniteau County | MO | 29135 | | Jefferson City, MO 27620 | Columbia-Jefferson
City-Moberly, MO 190 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=MoniteauCounty+MO |
| | Mississippi County | MO | 29133 | | Sikeston, MO 43460 | Cape Girardeau-Sikeston,
MO-IL 164 | Outlying | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=MississippiCounty+MO |
| | Miller County | MO | 29131 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=MillerCounty+MO |