| | Coke County | TX | 48081 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=CokeCounty+TX |
| | Coleman County | TX | 48083 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ColemanCounty+TX |
| | Collingsworth County | TX | 48087 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CollingsworthCounty+TX |
| | Colorado County | TX | 48089 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ColoradoCounty+TX |
| | Comanche County | TX | 48093 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ComancheCounty+TX |
| | Concho County | TX | 48095 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ConchoCounty+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 |