| Code | Name | Region |
|---|---|---|
| CHKOZ | Koniz | BE |
| CHKON | Konolfingen | BE |
| CHKPP | Koppigen | BE |
| CHKWI | Kottwil | LU |
| CHKRA | Kradolf | TG |
| CHKRT | Krauchthal | BE |
| CHKRZ | Kreuzlingen | TG |
| CHKRI | Kriegstetten | SO |
| CHKRS | Kriens | LU |
| CHKSN | Kriessern | SG |
| CHKNN | Kunten | AG |
| CHKHH | Kusnacht | ZH |
| CHKSS | Kussnacht | SZ |
| CHKSR | Kussnacht Am Rigi | SZ |
| CHKT5 | Kuttigen | AG |
| CHKEH | Kemptthal | ZH |
| CHKER | Kerns | OW |
| CHKEZ | Kerzers | FR |
| CHKSW | Kesswil | TG |
| CHKSO | Kestenholz | SO |
| CHKIB | Kienberg | SO |
| CHKIE | Kiesen | BE |
| CHKIL | Kilchberg | ZH |
| CHKIW | Killwangen | AG |
| CHKHB | Kirchberg | BE |
| CHKRG | Kirchberg | SG |
| CHKCO | Kirchdorf | BE |
| CHKLR | Kirchleerau | AG |
| CHBEK | Kirchlindach | BE |
| CHKLF | Kleinandelfingen | ZH |
| CHKBO | Kleinbosingen | FR |
| CHKDO | Kleindottingen | AG |
| CHKLL | Kleinlutzel | BL |
| CHRGU | Klingnau | AG |
| CHKLS | Klosters | GR |
| CHJBG | Jaberg | BE |
| CHJGT | Jegenstorf | BE |
| CHJNS | Jenins | GR |
| CHBEJ | Jens | BE |
| CHJON | Jona | SG |
| CHJNE | Jonen | AG |
| CHJNG | Jongny | VD |
| CHJWL | Jonschwil | SG |
| CHJXT | Jouxtens-mezery | VD |
| CHJSY | Jussy | GE |
| CHKGT | Kaiseraugst | AG |
| CHKAI | Kaisten | AG |
| CHKNH | Kallnach | BE |
| CHKAL | Kaltbrunn | SG |
| CHKDG | Kandergrund | BE |