| | El Paso County | TX | 48141 | | El Paso, TX 21340 | El Paso-Las Cruces, TX-NM 238 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=ElPasoCounty+TX |
| | Erath County | TX | 48143 | | Stephenville, TX 44500 | | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=ErathCounty+TX |
| | Falls County | TX | 48145 | | Waco, TX 47380 | | Outlying | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=FallsCounty+TX |
| | Fannin County | TX | 48147 | | Bonham, TX 14300 | Dallas-Fort Worth, TX-OK 206 | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=FanninCounty+TX |
| | Fayette County | TX | 48149 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=FayetteCounty+TX |
| | Fisher County | TX | 48151 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=FisherCounty+TX |
| | Floyd County | TX | 48153 | | Plainview, TX 38380 | Lubbock-Plainview, TX 352 | Outlying | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=FloydCounty+TX |
| | Foard County | TX | 48155 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=FoardCounty+TX |
| | Fort Bend County | TX | 48157 | | Houston-Pasadena-The
Woodlands, TX 26420 | Houston-Pasadena, TX 288 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=FortBendCounty+TX |
| | Franklin County | TX | 48159 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=FranklinCounty+TX |