| | Kenedy County | TX | 48261 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=KenedyCounty+TX |
| | Kent County | TX | 48263 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=KentCounty+TX |
| | Kerr County | TX | 48265 | | Kerrville, TX 28500 | San Antonio-New
Braunfels-Kerrville, TX 484 | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=KerrCounty+TX |
| | Kimble County | TX | 48267 | | | | | nonmetro county (rural) | recreation | https://maps.google.com/?q=KimbleCounty+TX |
| | King County | TX | 48269 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=KingCounty+TX |
| | Kinney County | TX | 48271 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=KinneyCounty+TX |
| | Kleberg County | TX | 48273 | | Kingsville, TX 28780 | Corpus
Christi-Kingsville-Alice,
TX 204 | Central | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=KlebergCounty+TX |
| | Knox County | TX | 48275 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=KnoxCounty+TX |
| | La Salle County | TX | 48283 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=LaSalleCounty+TX |
| | Lamar County | TX | 48277 | | Paris, TX 37580 | | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=LamarCounty+TX |