| Municipality | ZIP Code |
|---|---|
| Basco | 3900 |
| Location | Municipality | Province | Region | ZIP Code |
|---|---|---|---|---|
| Chanarian | Basco | Batanes | Cagayan Valley | 3900 |
| Ihubok I | Basco | Batanes | Cagayan Valley | 3900 |
| Ihubok II | Basco | Batanes | Cagayan Valley | 3900 |
| Kayhuvokan | Basco | Batanes | Cagayan Valley | 3900 |
| San Antonio | Basco | Batanes | Cagayan Valley | 3900 |
| San Joaquin | Basco | Batanes | Cagayan Valley | 3900 |
