| | Coryell County | TX | 48099 | | Killeen-Temple, TX 28660 | | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=CoryellCounty+TX |
| | Cottle County | TX | 48101 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CottleCounty+TX |
| | Crane County | TX | 48103 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=CraneCounty+TX |
| | Crockett County | TX | 48105 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=CrockettCounty+TX |
| | Culberson County | TX | 48109 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=CulbersonCounty+TX |
| | Dallam County | TX | 48111 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DallamCounty+TX |
| | Dawson County | TX | 48115 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DawsonCounty+Texas |
| | Deaf Smith County | TX | 48117 | | Hereford, TX 25820 | | Central | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=DeafSmithCounty+TX |
| | Delta County | TX | 48119 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=DeltaCounty+TX |
| | DeWitt County | TX | 48123 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DeWittCounty+TX |