| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Buk, Buk | 64-320 |
| Postal/ZIP Codes in Cieśle, Buk | 64-320 |
| Postal/ZIP Codes in Dakowy Suche, Buk | 64-320 |
| Postal/ZIP Codes in Dobieżyn, Buk | 64-320 |
| Postal/ZIP Codes in Dobra, Buk | 64-320 |
| Postal/ZIP Codes in Kalwy, Buk | 64-320 |
| Postal/ZIP Codes in Niepruszewo, Buk | 64-320 |
| Postal/ZIP Codes in Otusz, Buk | 64-320 |
| Postal/ZIP Codes in Pawłówko, Buk | 64-320 |
| Postal/ZIP Codes in Szewce, Buk | 64-320 |
| Postal/ZIP Codes in Sznyfin, Buk | 64-320 |
| Postal/ZIP Codes in Wielka Wieś, Buk | 64-320 |
| Postal/ZIP Codes in Wiktorowo, Buk | 64-320 |
| Postal/ZIP Codes in Wygoda, Buk | 64-320 |
| Postal/ZIP Codes in Wysoczka, Buk | 64-320 |
| Postal/ZIP Codes in Żegowo, Buk | 64-320 |