| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Kotlin, Kotlin | 63-220 |
| Postal/ZIP Codes in Kurcew, Kotlin | 63-220 |
| Postal/ZIP Codes in Magnuszewice, Kotlin | 63-220 |
| Postal/ZIP Codes in Orpiszewek, Kotlin | 63-220 |
| Postal/ZIP Codes in Parzew, Kotlin | 63-220 |
| Postal/ZIP Codes in Racendów, Kotlin | 63-220 |
| Postal/ZIP Codes in Sławoszew, Kotlin | 63-220 |
| Postal/ZIP Codes in Twardów, Kotlin | 63-220 |
| Postal/ZIP Codes in Wilcza, Kotlin | 63-220 |
| Postal/ZIP Codes in Wola Książęca, Kotlin | 63-220 |
| Postal/ZIP Codes in Wysogotówek, Kotlin | 63-220 |
| Postal/ZIP Codes in Wyszki, Kotlin | 63-220 |