Liste de la région
- 9223 NE - Houtigehage, Smallingerland, Friesland
- 9223 NG - Houtigehage, Smallingerland, Friesland
- 9223 NH - Houtigehage, Smallingerland, Friesland
- 9223 NJ - Houtigehage, Smallingerland, Friesland
- 9223 NK - Houtigehage, Smallingerland, Friesland
- 9223 NL - Houtigehage, Smallingerland, Friesland
- 9223 NM - Houtigehage, Smallingerland, Friesland
- 9223 NN - Houtigehage, Smallingerland, Friesland
- 9223 NP - Houtigehage, Smallingerland, Friesland