| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Castro, San Pedro | 21204 |
| Postal/ZIP Codes in Concha, San Pedro | 21204 |
| Postal/ZIP Codes in Pueblo Seco, San Pedro | 21204 |
| Postal/ZIP Codes in San Pedro, San Pedro | 21204 |
| Postal/ZIP Codes in Talolinga, San Pedro | 21204 |
| Postal/ZIP Codes in Trojas, San Pedro | 21204 |