Sebaste comprises 10 barangays with an estimated population of 19,328. 4 of its barangays (40%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Abiera | 2,599 | 1 | Crowdsourced signal only (no registered tower) |
| Aguila | 1,367 | 0 | Dead zone: no towers from any source |
| Alegre | 698 | 0 | Dead zone: no towers from any source |
| Aras-Asan | 1,910 | 3 | Crowdsourced signal only (no registered tower) |
| Bacalan | 2,098 | 1 | Crowdsourced signal only (no registered tower) |
| Callan | 2,184 | 1 | Crowdsourced signal only (no registered tower) |
| Idio | 2,437 | 3 | Crowdsourced signal only (no registered tower) |
| Nauhon | 929 | 0 | Dead zone: no towers from any source |
| P. Javier | 637 | 0 | Dead zone: no towers from any source |
| Poblacion | 4,469 | 1 | Crowdsourced signal only (no registered tower) |