| Code | Name | Region |
|---|---|---|
| NLKBK | Klarenbeek | GE |
| NLKLZ | Klazienaveen | DR |
| NLKNZ | Klein-zundert | NB |
| NLKLN | Klimmen | LI |
| NLKOT | Kloetinge | ZE |
| NLKTL | Kloosterburen | |
| NLJNE | Junne | OV |
| NLKAG | Kaag | |
| NLKAA | Kaag En Braassem | ZH |
| NLKTS | Kaatsheuvel | |
| NLKKO | Kakeshoek | |
| NLKMR | Kamerik | |
| NLKAM | Kampen | |
| NLKAD | Kamperland | ZE |
| NLKTN | Kantens | GR |
| NLKAV | Kapel-avezaath | GE |
| NLKPL | Kapelle | |
| NLKAP | Kapellebrug | |
| NLKTV | Katerveer | OV |
| NLKTJ | Katlijk | FR |
| NLKAT | Kats | ZE |
| NLKWK | Katwijk | |
| NLKWI | Katwijk | NB |
| NLKWR | Katwijk Aan Den Rijn | ZH |
| NLKAZ | Katwijk Aan Zee | |
| NLKWO | Katwoude | NH |
| NLOSR | Hulshorst | GE |
| NLHUL | Hulst | |
| NLHML | Hummelo | GE |
| NLHUN | Hunsel | LI |
| NLIDS | Idskenhuizen | FL |
| NLIJH | Ijhorst | OV |
| NLJST | Ijlst | FR |
| NLIJM | Ijmuiden/velsen | |
| NLISM | Ijsselmuiden | OV |
| NLIJI | Ijsselstein | |
| NLSL7 | Ijsselsteyn | LI |
| NLIZD | Ijzendijke | |
| NLILO | Illikhoven | LI |
| NLILP | Ilpendam | |
| NLING | Ingen | GE |
| NLITR | Itteren | LI |
| NLITT | Ittervoort | |
| NLJSP | Jisp | NH |
| NLJOU | Joure | |
| NLJLD | Julianadorp | |
| NLHKK | Hoogkerk | GR |
| NLHOL | Hoogland | |
| NLHOG | Hooglanderveen | |
| NLHGM | Hoogmade | ZH |