| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Kostelec, Kostelec | 349 01 |
| Postal/ZIP Codes in Lšelín, Kostelec | 349 01 |
| Postal/ZIP Codes in Nedražice, Kostelec | 349 01 |
| Postal/ZIP Codes in Ostrov u Stříbra, Kostelec | 349 01 |
| Postal/ZIP Codes in Popov, Kostelec | 330 23 |
| Postal/ZIP Codes in Vrhaveč, Kostelec | 330 23 |