| Code | Name | Region |
|---|---|---|
| CZKZO | Kozomin | ST |
| CZKTY | Kozusany-tazaly | OL |
| CZKZU | Kozusice | JM |
| CZKHO | Krahulov | VY |
| CZKOB | Kobyli | PA |
| CZKOJ | Kojetice | ST |
| CZKLN | Kolin | |
| CZKMA | Komarov | MO |
| CZKMV | Komarov | ST |
| CZKNC | Konarovice | ST |
| CZKNY | Konojedy | PR |
| CZKOP | Koprivnice | |
| CZKOE | Kornice | 53 |
| CZORO | Korotice | ST |
| CZKOR | Korycany | JM |
| CZKSI | Kosice | 20 |
| CZKMY | Kosmonosy | ST |
| CZKOQ | Kosor | ST |
| CZKTA | Kostalov | |
| CZKOS | Kostany | US |
| CZKAY | Kostelany Nad Moravou | 72 |
| CZKOL | Kostelec | JM |
| CZKHK | Kostelec Na Hane | OL |
| CZKCL | Kostelec Nad Cernymi Lesy | |
| CZKEL | Kelc | ZL |
| CZKKX | Kelniky | ZL |
| CZKLD | Kladno | |
| CZKNM | Kladruby Nad Labem | PA |
| CZKHJ | Klaster Hradiste Nad Jizerou | ST |
| CZKNO | Klasterec Nad Ohri | |
| CZKCC | Klasterec Nad Orlici | |
| CZKTV | Klatovy | |
| CZSYK | Klecany | ST |
| CZKNH | Klenovice Na Hane | OL |
| CZKLC | Klicany | |
| CZKMK | Klimkovice | |
| CZJLA | Klobouky U Brna | JM |
| CZKCX | Klucov | ST |
| CZKZE | Knezeves | ST |
| CZKNE | Knezice | KR |
| CZKZM | Knezmost | ST |
| CZKNZ | Kneznice | KR |
| CZKNI | Kninice | VY |
| CZMKE | Koberice | MO |
| CZKNL | Kamenice Nad Lipou | |
| CZKSV | Kamenicky Senov | |
| CZKMN | Kamenna | |
| CZKUJ | Kamenny Ujezd | JC |
| CZKVO | Kamyk Nad Vltavou | |
| CZKAP | Kaplice |