Culasi comprises 44 barangays with an estimated population of 40,416. 30 of its barangays (68%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alojipan | 907 | 0 | Dead zone: no towers from any source |
| Bagacay | 1,832 | 0 | Dead zone: no towers from any source |
| Balac-balac | 407 | 2 | Crowdsourced signal only (no registered tower) |
| Batbatan Island | 1,654 | 0 | Dead zone: no towers from any source |
| Batonan Norte | 602 | 0 | Dead zone: no towers from any source |
| Batonan Sur | 696 | 0 | Dead zone: no towers from any source |
| Bita | 102 | 0 | Dead zone: no towers from any source |
| Bitadton Norte | 716 | 0 | Dead zone: no towers from any source |
| Bitadton Sur | 1,824 | 0 | Dead zone: no towers from any source |
| Buenavista | 1,111 | 0 | Dead zone: no towers from any source |
| Buhi | 548 | 2 | Crowdsourced signal only (no registered tower) |
| Camancijan | 2,635 | 0 | Dead zone: no towers from any source |
| Caridad | 1,172 | 1 | Crowdsourced signal only (no registered tower) |
| Carit-an | 292 | 2 | Crowdsourced signal only (no registered tower) |
| Centro Norte (Pob.) | 2,391 | 3 | Crowdsourced signal only (no registered tower) |
| Centro Poblacion | 2,860 | 3 | Crowdsourced signal only (no registered tower) |
| Centro Sur (Pob.) | 1,150 | 0 | Dead zone: no towers from any source |
| Condes | 209 | 0 | Dead zone: no towers from any source |
| Esperanza | 850 | 0 | Dead zone: no towers from any source |
| Fe | 1,036 | 1 | Crowdsourced signal only (no registered tower) |
| Flores | 1,077 | 0 | Dead zone: no towers from any source |
| Jalandoni | 952 | 4 | Crowdsourced signal only (no registered tower) |
| Janlagasi | 442 | 1 | Crowdsourced signal only (no registered tower) |
| Lamputong | 618 | 0 | Dead zone: no towers from any source |
| Lipata | 1,475 | 0 | Dead zone: no towers from any source |
| Magsaysay (Balua) | 925 | 0 | Dead zone: no towers from any source |
| Malacañang | 1,485 | 0 | Dead zone: no towers from any source |
| Malalison Island | 229 | 2 | Crowdsourced signal only (no registered tower) |
| Maniguin | 385 | 0 | Dead zone: no towers from any source |
| Naba | 1,119 | 3 | Crowdsourced signal only (no registered tower) |
| Osorio | 586 | 0 | Dead zone: no towers from any source |
| Paningayan | 1,215 | 0 | Dead zone: no towers from any source |
| Salde | 180 | 0 | Dead zone: no towers from any source |
| San Antonio | 1,138 | 0 | Dead zone: no towers from any source |
| San Gregorio | 286 | 4 | Crowdsourced signal only (no registered tower) |
| San Juan | 627 | 0 | Dead zone: no towers from any source |
| San Luis | 868 | 1 | Crowdsourced signal only (no registered tower) |
| San Pascual | 699 | 0 | Dead zone: no towers from any source |
| San Vicente | 354 | 0 | Dead zone: no towers from any source |
| Simbola | 628 | 0 | Dead zone: no towers from any source |
| Tigbobolo | 349 | 0 | Dead zone: no towers from any source |
| Tinabusan | 256 | 0 | Dead zone: no towers from any source |
| Tomao | 887 | 0 | Dead zone: no towers from any source |
| Valderama | 642 | 5 | Crowdsourced signal only (no registered tower) |