Zambales has 247 barangays across 14 municipalities. 98 barangays (40%) are connectivity dead zones.
| Municipality | Barangays | Dead zones |
|---|---|---|
| Botolan | 31 | 18 (58%) |
| Cabangan | 22 | 14 (64%) |
| Candelaria | 16 | 8 (50%) |
| Castillejos | 14 | 4 (29%) |
| Iba (Capital) | 14 | 4 (29%) |
| Masinloc | 13 | 0 (0%) |
| Olongapo City | 17 | 0 (0%) |
| Palauig | 19 | 9 (47%) |
| San Antonio | 14 | 3 (21%) |
| San Felipe | 11 | 5 (45%) |
| San Marcelino | 18 | 10 (56%) |
| San Narciso | 17 | 7 (41%) |
| Santa Cruz | 25 | 14 (56%) |
| Subic | 16 | 2 (12%) |