| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Bel Rios, Diamantino | 78401-000 |
| Postal/ZIP Codes in Del Rios, Diamantino | 78405-000 |
| Postal/ZIP Codes in Diamantino, Diamantino | 78400-000 |
| Postal/ZIP Codes in Novo Diamantino, Diamantino | 78402-000 |
| Postal/ZIP Codes in Sumidouro, Diamantino | 78404-000 |