| | | Nacogdoches County | TX | 48347 | | Nacogdoches, TX 34860 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=NacogdochesCounty+TX |
| | | Motley County | TX | 48345 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=MotleyCounty+TX |
| | | Morris County | TX | 48343 | | Mount Pleasant, TX 34420 | | Outlying | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=MorrisCounty+TX |
| | | Moore County | TX | 48341 | | Dumas, TX 20300 | | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=MooreCounty+TX |
| | | Montgomery County | TX | 48339 | | Houston-Pasadena-The
Woodlands, TX 26420 | Houston-Pasadena, TX 288 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=MontgomeryCounty+TX |
| | | Montague County | TX | 48337 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=MontagueCounty+TX |
| | | Mitchell County | TX | 48335 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=MitchellCounty+TX |
| | | Mills County | TX | 48333 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=MillsCounty+TX |
| | | Milam County | TX | 48331 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=MilamCounty+TX |
| | | Midland County | TX | 48329 | | Midland, TX 33260 | Midland-Odessa-Andrews,
TX 372 | Central | metro county (urban) | mining-dependent | https://maps.google.com/?q=MidlandCounty+TX |
