| | Camp County | TX | 48063 | | Mount Pleasant, TX 34420 | | Outlying | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CampCounty+TX |
| | Cass County | TX | 48067 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CassCounty+TX |
| | Cherokee County | TX | 48073 | | Jacksonville, TX 27380 | Tyler-Jacksonville, TX 540 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CherokeeCounty+TX |
| | Collin County | TX | 48085 | Dallas-Plano-Irving, TX 19124 | Dallas-Fort
Worth-Arlington, TX 19100 | Dallas-Fort Worth, TX-OK 206 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=CollinCounty+TX |
| | Colorado County | TX | 48089 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=ColoradoCounty+TX |
| | Dallam County | TX | 48111 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DallamCounty+TX |
| | Dallas County | TX | 48113 | Dallas-Plano-Irving, TX 19124 | Dallas-Fort
Worth-Arlington, TX 19100 | Dallas-Fort Worth, TX-OK 206 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=DallasCounty+TX |
| | Dawson County | TX | 48115 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DawsonCounty+Texas |
| | Denton County | TX | 48121 | Dallas-Plano-Irving, TX 19124 | Dallas-Fort
Worth-Arlington, TX 19100 | Dallas-Fort Worth, TX-OK 206 | Outlying | metro county (urban) | nonspecialized | https://maps.google.com/?q=DentonCounty+TX |
| | DeWitt County | TX | 48123 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DeWittCounty+TX |