| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Born, Sittard-Geleen | 6121 |
| Postal/ZIP Codes in Buchten, Sittard-Geleen | 6122 |
| Postal/ZIP Codes in Einighausen, Sittard-Geleen | 6142 |
| Postal/ZIP Codes in Geleen, Sittard-Geleen | 6161, 6162, 6163, 6164, 6165, … |
| Postal/ZIP Codes in Grevenbicht, Sittard-Geleen | 6127 |
| Postal/ZIP Codes in Guttecoven, Sittard-Geleen | 6143 |
| Postal/ZIP Codes in Holtum, Sittard-Geleen | 6123 |
| Postal/ZIP Codes in Limbricht, Sittard-Geleen | 6141 |
| Postal/ZIP Codes in Munstergeleen, Sittard-Geleen | 6151 |
| Postal/ZIP Codes in Obbicht, Sittard-Geleen | 6125 |
| Postal/ZIP Codes in Papenhoven, Sittard-Geleen | 6124 |
| Postal/ZIP Codes in Sittard, Sittard-Geleen | 6131, 6132, 6133, 6134, 6135, … |
| Postal/ZIP Codes in Windraak, Sittard-Geleen | 6153 |