Casiguran comprises 24 barangays with an estimated population of 23,853. 19 of its barangays (79%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Barangay 1 (Pob.) | 258 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay 2 (Pob.) | 248 | 0 | Dead zone: no towers from any source |
| Barangay 3 (Pob.) | 66 | 0 | Dead zone: no towers from any source |
| Barangay 4 (Pob.) | 94 | 0 | Dead zone: no towers from any source |
| Barangay 5 (Pob.) | 43 | 0 | Dead zone: no towers from any source |
| Barangay 6 (Pob.) | 88 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay 7 (Pob.) | 245 | 0 | Dead zone: no towers from any source |
| Barangay 8 (Pob.) | 210 | 0 | Dead zone: no towers from any source |
| Bianuan | 3,488 | 4 | Crowdsourced signal only (no registered tower) |
| Calabgan | 47 | 0 | Dead zone: no towers from any source |
| Calangcuasan | 1,327 | 0 | Dead zone: no towers from any source |
| Calantas | 1,748 | 0 | Dead zone: no towers from any source |
| Cozo | 1,701 | 0 | Dead zone: no towers from any source |
| Culat | 1,092 | 6 | Crowdsourced signal only (no registered tower) |
| Dibacong | 2,123 | 0 | Dead zone: no towers from any source |
| Dibet | 2,748 | 0 | Dead zone: no towers from any source |
| Ditinagyan | 281 | 0 | Dead zone: no towers from any source |
| Esperanza | 52 | 0 | Dead zone: no towers from any source |
| Esteves | 1,439 | 0 | Dead zone: no towers from any source |
| Lual | 813 | 0 | Dead zone: no towers from any source |
| Marikit | 2,438 | 0 | Dead zone: no towers from any source |
| San Ildefonso | 629 | 0 | Dead zone: no towers from any source |
| Tabas | 1,707 | 0 | Dead zone: no towers from any source |
| Tinib | 968 | 4 | Crowdsourced signal only (no registered tower) |