| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Cairu, Cairu | 45420-000 |
| Postal/ZIP Codes in Galeão, Cairu | 45422-000 |
| Postal/ZIP Codes in Gamboa, Cairu | 45424-000 |
| Postal/ZIP Codes in Morro de São Paulo, Cairu | 45428-000 |
| Postal/ZIP Codes in Velha Boipeba, Cairu | 45426-000 |