Catanduanes has 315 barangays across 11 municipalities. 258 barangays (82%) are connectivity dead zones.
| Municipality | Barangays | Dead zones |
|---|---|---|
| Bagamanoc | 18 | 18 (100%) |
| Baras | 29 | 15 (52%) |
| Bato | 27 | 16 (59%) |
| Caramoran | 27 | 25 (93%) |
| Gigmoto | 9 | 9 (100%) |
| Pandan | 26 | 25 (96%) |
| Panganiban (Payo) | 23 | 23 (100%) |
| San Andres (Calolbon) | 38 | 34 (89%) |
| San Miguel | 24 | 24 (100%) |
| Viga | 31 | 26 (84%) |
| Virac (Capital) | 63 | 43 (68%) |