| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Blizna, Ostrów | 39-104 |
| Postal/ZIP Codes in Borek Mały, Ostrów | 39-120 |
| Postal/ZIP Codes in Kamionka, Ostrów | 39-122 |
| Postal/ZIP Codes in Kozodrza, Ostrów | 39-103 |
| Postal/ZIP Codes in Ocieka, Ostrów | 39-104 |
| Postal/ZIP Codes in Ostrów, Ostrów | 39-103 |
| Postal/ZIP Codes in Skrzyszów, Ostrów | 39-103 |
| Postal/ZIP Codes in Wola Ociecka, Ostrów | 39-104 |
| Postal/ZIP Codes in Zdżary, Ostrów | 39-104 |