| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Boqueirão, Seixal | 9270-132 |
| Postal/ZIP Codes in Chão da Cancela, Seixal | 9270-135 |
| Postal/ZIP Codes in Chão da Ribeira, Seixal | 9270-134 |
| Postal/ZIP Codes in Cova, Seixal | 9270-121 |
| Postal/ZIP Codes in Fajã da Parreira, Seixal | 9270-122 |
| Postal/ZIP Codes in Farrobo, Seixal | 9270 |
| Postal/ZIP Codes in Feiteiras, Seixal | 9270-124 |
| Postal/ZIP Codes in Lombinho, Seixal | 9270-125 |
| Postal/ZIP Codes in Penedo, Seixal | 9270-126 |
| Postal/ZIP Codes in Portada, Seixal | 9270-127 |
| Postal/ZIP Codes in Ribeira da Laje, Seixal | 9270-128 |
| Postal/ZIP Codes in Ribeira Funda, Seixal | 9270-129 |
| Postal/ZIP Codes in Seixal, Seixal | 9270 |
| Postal/ZIP Codes in Serra de Água, Seixal | 9270-130 |
| Postal/ZIP Codes in Serrado, Seixal | 9270-131 |