Sibalom comprises 76 barangays with an estimated population of 60,377. 64 of its barangays (84%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alangan | 751 | 0 | Dead zone: no towers from any source |
| Bari | 570 | 0 | Dead zone: no towers from any source |
| Biga-a | 627 | 0 | Dead zone: no towers from any source |
| Bongbongan I | 293 | 0 | Dead zone: no towers from any source |
| Bongbongan II | 1,440 | 1 | Crowdsourced signal only (no registered tower) |
| Bongsod | 610 | 3 | Crowdsourced signal only (no registered tower) |
| Bontol | 709 | 0 | Dead zone: no towers from any source |
| Bugnay | 928 | 0 | Dead zone: no towers from any source |
| Bulalacao | 357 | 0 | Dead zone: no towers from any source |
| Cabanbanan | 456 | 0 | Dead zone: no towers from any source |
| Cabariuan | 830 | 0 | Dead zone: no towers from any source |
| Cabladan | 756 | 0 | Dead zone: no towers from any source |
| Cadoldolan | 1,234 | 0 | Dead zone: no towers from any source |
| Calo-oy | 384 | 0 | Dead zone: no towers from any source |
| Calog | 456 | 0 | Dead zone: no towers from any source |
| Catmon | 738 | 0 | Dead zone: no towers from any source |
| Catungan I | 558 | 1 | Crowdsourced signal only (no registered tower) |
| Catungan II | 312 | 0 | Dead zone: no towers from any source |
| Catungan III | 259 | 0 | Dead zone: no towers from any source |
| Catungan IV | 801 | 0 | Dead zone: no towers from any source |
| Cubay-Napultan | 788 | 2 | Crowdsourced signal only (no registered tower) |
| Cubay-Sermon | 975 | 0 | Dead zone: no towers from any source |
| District I (Pob.) | 2,907 | 4 | Crowdsourced signal only (no registered tower) |
| District II (Pob.) | 1,496 | 1 | Crowdsourced signal only (no registered tower) |
| District III (Pob.) | 3,734 | 3 | Crowdsourced signal only (no registered tower) |
| District IV (Pob.) | 1,375 | 1 | Crowdsourced signal only (no registered tower) |
| Egaña | 1,162 | 0 | Dead zone: no towers from any source |
| Esperanza I | 626 | 0 | Dead zone: no towers from any source |
| Esperanza II | 230 | 0 | Dead zone: no towers from any source |
| Esperanza III | 239 | 0 | Dead zone: no towers from any source |
| Igcococ | 767 | 0 | Dead zone: no towers from any source |
| Igdagmay | 165 | 0 | Dead zone: no towers from any source |
| Igdalaquit | 938 | 0 | Dead zone: no towers from any source |
| Iglanot | 583 | 0 | Dead zone: no towers from any source |
| Igpanolong | 291 | 0 | Dead zone: no towers from any source |
| Igparas | 396 | 0 | Dead zone: no towers from any source |
| Igsuming | 883 | 0 | Dead zone: no towers from any source |
| Ilabas | 1,975 | 0 | Dead zone: no towers from any source |
| Imparayan | 839 | 0 | Dead zone: no towers from any source |
| Inabasan | 359 | 0 | Dead zone: no towers from any source |
| Indag-an | 475 | 0 | Dead zone: no towers from any source |
| Initan | 280 | 0 | Dead zone: no towers from any source |
| Insarayan | 376 | 0 | Dead zone: no towers from any source |
| Lacaron | 2,140 | 0 | Dead zone: no towers from any source |
| Lagdo | 291 | 0 | Dead zone: no towers from any source |
| Lambayagan | 545 | 0 | Dead zone: no towers from any source |
| Luna | 212 | 0 | Dead zone: no towers from any source |
| Luyang | 514 | 0 | Dead zone: no towers from any source |
| Maasin | 484 | 0 | Dead zone: no towers from any source |
| Mabini | 711 | 0 | Dead zone: no towers from any source |
| Millamena | 183 | 0 | Dead zone: no towers from any source |
| Mojon | 513 | 0 | Dead zone: no towers from any source |
| Nagdayao | 1,544 | 0 | Dead zone: no towers from any source |
| Nazareth | 828 | 0 | Dead zone: no towers from any source |
| Odiong | 1,291 | 6 | Crowdsourced signal only (no registered tower) |
| Olaga | 447 | 0 | Dead zone: no towers from any source |
| Pangpang | 625 | 9 | Crowdsourced signal only (no registered tower) |
| Panlagangan | 281 | 0 | Dead zone: no towers from any source |
| Pantao | 713 | 0 | Dead zone: no towers from any source |
| Pasong | 335 | 0 | Dead zone: no towers from any source |
| Pis-Anan | 2,085 | 0 | Dead zone: no towers from any source |
| Rombang | 670 | 2 | Crowdsourced signal only (no registered tower) |
| Salvacion | 734 | 0 | Dead zone: no towers from any source |
| San Juan | 1,133 | 1 | Crowdsourced signal only (no registered tower) |
| Sido | 1,065 | 0 | Dead zone: no towers from any source |
| Solong | 1,989 | 0 | Dead zone: no towers from any source |
| Tabongtabong | 279 | 0 | Dead zone: no towers from any source |
| Tig-Ohot | 547 | 0 | Dead zone: no towers from any source |
| Tigbalua I | 261 | 0 | Dead zone: no towers from any source |
| Tigbalua II | 254 | 0 | Dead zone: no towers from any source |
| Tordesillas | 1,122 | 0 | Dead zone: no towers from any source |
| Tulatula | 448 | 0 | Dead zone: no towers from any source |
| Valentin Grasparil (Bad-as) | 729 | 0 | Dead zone: no towers from any source |
| Villafont | 449 | 0 | Dead zone: no towers from any source |
| Villahermosa | 572 | 0 | Dead zone: no towers from any source |
| Villar | 1,455 | 0 | Dead zone: no towers from any source |