| Code | Name | Region |
|---|---|---|
| GRKKZ | Kilkis | |
| GRKAG | Karkinagri Ikarias | 84 |
| GRAOK | Karpathos | |
| GRKSS | Karpenisi | |
| GRKAY | Karya | 42 |
| GRKST | Karystos | |
| GRKAD | Kassandra | 64 |
| GRKSP | Kassiopi Corfu | 22 |
| GRKSJ | Kassos | |
| GRKIS | Kastelli Kissamou | |
| GRKAS | Kastellorizou (ex Megisti) | 81 |
| GRKZS | Kastelorizo | |
| GRKSO | Kastoria | |
| GRKSI | Kastos Island | 23 |
| GRKAK | Katakolon | |
| GRKTP | Katapola | 82 |
| GRKEI | Katerini | |
| GRKAH | Kato Achaia | |
| GRKAC | Kato Akhaia | |
| GRDOL | Kato Doliana | J |
| GRKGT | Kato Gefya | 54 |
| GRKLX | Kalamata | |
| GRKAI | Kalamos Island (lefkada) | 23 |
| GRKLP | Kalampaka | 44 |
| GRKLD | Kalathos Rodou | 81 |
| GRKLL | Kalilimenes | |
| GRKCH | Kalives Valtsaiikes | |
| GRKLA | Kallithea/athinai | |
| GRKLH | Kalochori | 54 |
| GRKMI | Kalymnos | 81 |
| GRKLY | Kalyvia Thorikou | I |
| GRKRE | Kamares Sifnos | 82 |
| GRKT6 | Kamateron | I |
| GRKAM | Kaminia | 33 |
| GRKSK | Kamiros Skala | 81 |
| GRAPA | Kapandrition | A1 |
| GRVOR | Kapparia | |
| GRKAP | Kapsalion (kythira) | |
| GRKRM | Kardamaina Kos | 81 |
| GRKDM | Kardamyla | 85 |
| GRKRD | Karditsa | 41 |
| GRJIK | Ikaria | 84 |
| GRIKN | Ikonian | |
| GRILI | Ilion | A1 |
| GRILO | Ilioupolis | A1 |
| GRINF | Inofyta | |
| GRINO | Inousses | |
| GRIOA | Ioannina | |
| GRIOS | Ios | |
| GRIRA | Iraklia | 62 |