Sual comprises 19 barangays with an estimated population of 31,461. 8 of its barangays (42%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Baquioen | 1,846 | 0 | Dead zone: no towers from any source |
| Baybay Norte | 460 | 3 | Crowdsourced signal only (no registered tower) |
| Baybay Sur | 2,037 | 4 | Crowdsourced signal only (no registered tower) |
| Bolaoen | 335 | 0 | Dead zone: no towers from any source |
| Cabalitian | 636 | 0 | Dead zone: no towers from any source |
| Calumbuyan | 426 | 0 | Dead zone: no towers from any source |
| Camagsingalan | 579 | 17 | Crowdsourced signal only (no registered tower) |
| Caoayan | 4,054 | 13 | Crowdsourced signal only (no registered tower) |
| Capantolan | 1,334 | 2 | Crowdsourced signal only (no registered tower) |
| Macaycayawan | 626 | 1 | Crowdsourced signal only (no registered tower) |
| Paitan East | 597 | 5 | Crowdsourced signal only (no registered tower) |
| Paitan West | 2,204 | 1 | Crowdsourced signal only (no registered tower) |
| Pangascasan | 2,519 | 9 | Crowdsourced signal only (no registered tower) |
| Poblacion | 7,381 | 16 | Crowdsourced signal only (no registered tower) |
| Santo Domingo | 732 | 0 | Dead zone: no towers from any source |
| Seselangen | 1,823 | 3 | Crowdsourced signal only (no registered tower) |
| Sioasio East | 303 | 0 | Dead zone: no towers from any source |
| Sioasio West | 1,143 | 0 | Dead zone: no towers from any source |
| Victoria | 2,426 | 0 | Dead zone: no towers from any source |