Naguilian comprises 25 barangays with an estimated population of 54,077. 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 |
|---|---|---|---|
| Aguinaldo | 73 | 0 | Dead zone: no towers from any source |
| Bagong Sikat | 4,284 | 0 | Dead zone: no towers from any source |
| Burgos | 5,410 | 0 | Dead zone: no towers from any source |
| Cabaruan | 542 | 0 | Dead zone: no towers from any source |
| Flores | 2,593 | 0 | Dead zone: no towers from any source |
| La Union | 454 | 0 | Dead zone: no towers from any source |
| Magsaysay (Pob.) | 4,598 | 9 | Crowdsourced signal only (no registered tower) |
| Manaring | 242 | 0 | Dead zone: no towers from any source |
| Mansibang | 4,283 | 3 | Crowdsourced signal only (no registered tower) |
| Minallo | 6,240 | 1 | Crowdsourced signal only (no registered tower) |
| Minanga | 2,382 | 0 | Dead zone: no towers from any source |
| Palattao | 1,591 | 7 | Crowdsourced signal only (no registered tower) |
| Quezon (Pob.) | 1,033 | 1 | Crowdsourced signal only (no registered tower) |
| Quinalabasa | 1,147 | 0 | Dead zone: no towers from any source |
| Quirino (Pob.) | 1,105 | 0 | Dead zone: no towers from any source |
| Rangayan | 593 | 0 | Dead zone: no towers from any source |
| Rizal | 1,271 | 0 | Dead zone: no towers from any source |
| Roxas (Pob.) | 2,568 | 3 | Crowdsourced signal only (no registered tower) |
| San Manuel | 4,686 | 13 | Crowdsourced signal only (no registered tower) |
| Santa Victoria (Villa Capuchino) | 2,324 | 0 | Dead zone: no towers from any source |
| Santo Tomas | 263 | 0 | Dead zone: no towers from any source |
| Sunlife | 453 | 0 | Dead zone: no towers from any source |
| Surcoc | 1,681 | 0 | Dead zone: no towers from any source |
| Tomines | 605 | 0 | Dead zone: no towers from any source |
| Villa Paz | 3,656 | 0 | Dead zone: no towers from any source |