| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Ariaú, Barreirinha | 69165-000 |
| Postal/ZIP Codes in Barreirinha, Barreirinha | 69160-000 |
| Postal/ZIP Codes in Cametá, Barreirinha | 69162-000 |
| Postal/ZIP Codes in Freguesia do Andirá, Barreirinha | 69170-000 |
| Postal/ZIP Codes in Pedras, Barreirinha | 69175-000 |