Casiguran comprises 25 barangays with an estimated population of 31,407. 18 of its barangays (72%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Adovis (Pob.) | 439 | 1 | Crowdsourced signal only (no registered tower) |
| Boton | 2,435 | 0 | Dead zone: no towers from any source |
| Burgos | 586 | 0 | Dead zone: no towers from any source |
| Casay | 1,085 | 0 | Dead zone: no towers from any source |
| Cawit | 173 | 0 | Dead zone: no towers from any source |
| Central (Pob.) | 753 | 2 | Crowdsourced signal only (no registered tower) |
| Cogon | 517 | 0 | Dead zone: no towers from any source |
| Colambis | 1,476 | 0 | Dead zone: no towers from any source |
| Escuala | 457 | 0 | Dead zone: no towers from any source |
| Inlagadian | 1,144 | 0 | Dead zone: no towers from any source |
| Lungib | 4,234 | 0 | Dead zone: no towers from any source |
| Mabini | 739 | 0 | Dead zone: no towers from any source |
| Ponong | 1,152 | 0 | Dead zone: no towers from any source |
| Rizal | 785 | 1 | Crowdsourced signal only (no registered tower) |
| San Antonio (Boho) | 651 | 0 | Dead zone: no towers from any source |
| San Isidro | 1,413 | 0 | Dead zone: no towers from any source |
| San Juan | 1,730 | 0 | Dead zone: no towers from any source |
| San Pascual | 2,542 | 0 | Dead zone: no towers from any source |
| Santa Cruz | 2,065 | 3 | Crowdsourced signal only (no registered tower) |
| Somal-ot (Pob.) | 1,272 | 0 | Dead zone: no towers from any source |
| Tigbao | 775 | 0 | Dead zone: no towers from any source |
| Timbayog (Pob.) | 658 | 2 | Crowdsourced signal only (no registered tower) |
| Tiris | 729 | 0 | Dead zone: no towers from any source |
| Trece Martirez | 1,912 | 3 | Crowdsourced signal only (no registered tower) |
| Tulay | 1,685 | 1 | Crowdsourced signal only (no registered tower) |