| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Arenillas, Arenillas | 070506, 070507, 070604 |
| Postal/ZIP Codes in Cabo de Lampa, Arenillas | 070506 |
| Postal/ZIP Codes in El Guayacán, Arenillas | 070507 |
| Postal/ZIP Codes in La Cuca, Arenillas | 070506 |
| Postal/ZIP Codes in Puerto la Pitahaya, Arenillas | 070506 |
| Postal/ZIP Codes in Punta Brava, Arenillas | 070506 |
| Postal/ZIP Codes in Voluntad de Dios, Arenillas | 070507 |