| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Agras de Baixo, Oiã | 3770-051 |
| Postal/ZIP Codes in Agras de Cima, Oiã | 3770-051 |
| Postal/ZIP Codes in Águas Boas, Oiã | 3770 |
| Postal/ZIP Codes in Cabeço Perrães, Oiã | 3770-053 |
| Postal/ZIP Codes in Carris, Oiã | 3770-054 |
| Postal/ZIP Codes in Carro Quebrado, Oiã | 3770-055 |
| Postal/ZIP Codes in Facho, Oiã | 3770-056 |
| Postal/ZIP Codes in Giesta, Oiã | 3770-057 |
| Postal/ZIP Codes in Malhapão, Oiã | 3770 |
| Postal/ZIP Codes in Oiã, Oiã | 3770 |
| Postal/ZIP Codes in Pedreira, Oiã | 3770 |
| Postal/ZIP Codes in Perrães, Oiã | 3770-062 |
| Postal/ZIP Codes in Pousios, Oiã | 3770-063 |
| Postal/ZIP Codes in Rego, Oiã | 3770-064 |
| Postal/ZIP Codes in Silveira, Oiã | 3770-065 |
| Postal/ZIP Codes in Silveiro, Oiã | 3770-066 |
| Postal/ZIP Codes in Sudas, Oiã | 3770-067 |