Romblon has 219 barangays across 17 municipalities. 182 barangays (83%) are connectivity dead zones.
| Municipality | Barangays | Dead zones |
|---|---|---|
| Alcantara | 12 | 8 (67%) |
| Banton | 17 | 15 (88%) |
| Cajidiocan | 14 | 11 (79%) |
| Calatrava | 7 | 7 (100%) |
| Concepcion | 9 | 8 (89%) |
| Corcuera | 15 | 15 (100%) |
| Ferrol | 6 | 6 (100%) |
| Looc | 12 | 9 (75%) |
| Magdiwang | 9 | 7 (78%) |
| Odiongan | 25 | 14 (56%) |
| Romblon (Capital) | 31 | 23 (74%) |
| San Agustin | 15 | 15 (100%) |
| San Andres | 13 | 13 (100%) |
| San Fernando | 12 | 10 (83%) |
| San Jose | 5 | 5 (100%) |
| Santa Fe | 11 | 10 (91%) |
| Santa Maria (Imelda) | 6 | 6 (100%) |