Naguilian comprises 37 barangays with an estimated population of 64,067. 27 of its barangays (73%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Aguioas | 968 | 1 | Crowdsourced signal only (no registered tower) |
| Al-alinao Norte | 1,095 | 0 | Dead zone: no towers from any source |
| Al-alinao Sur | 1,232 | 1 | Crowdsourced signal only (no registered tower) |
| Ambaracao Norte | 1,221 | 0 | Dead zone: no towers from any source |
| Ambaracao Sur | 1,171 | 0 | Dead zone: no towers from any source |
| Angin | 897 | 0 | Dead zone: no towers from any source |
| Balecbec | 1,308 | 0 | Dead zone: no towers from any source |
| Bancagan | 673 | 0 | Dead zone: no towers from any source |
| Baraoas Norte | 1,175 | 0 | Dead zone: no towers from any source |
| Baraoas Sur | 3,096 | 0 | Dead zone: no towers from any source |
| Bariquir | 2,954 | 0 | Dead zone: no towers from any source |
| Bato | 4,081 | 2 | Crowdsourced signal only (no registered tower) |
| Bimmotobot | 2,162 | 0 | Dead zone: no towers from any source |
| Cabaritan Norte | 272 | 0 | Dead zone: no towers from any source |
| Cabaritan Sur | 1,232 | 2 | Crowdsourced signal only (no registered tower) |
| Casilagan | 7,058 | 0 | Dead zone: no towers from any source |
| Dal-lipaoen | 1,060 | 0 | Dead zone: no towers from any source |
| Daramuangan | 254 | 0 | Dead zone: no towers from any source |
| Guesset | 2,631 | 1 | Crowdsourced signal only (no registered tower) |
| Gusing Norte | 2,324 | 0 | Dead zone: no towers from any source |
| Gusing Sur | 2,059 | 0 | Dead zone: no towers from any source |
| Imelda | 315 | 3 | Crowdsourced signal only (no registered tower) |
| Lioac Norte | 1,219 | 0 | Dead zone: no towers from any source |
| Lioac Sur | 7,963 | 0 | Dead zone: no towers from any source |
| Magungunay | 812 | 1 | Crowdsourced signal only (no registered tower) |
| Mamat-ing Norte | 441 | 0 | Dead zone: no towers from any source |
| Mamat-ing Sur | 336 | 0 | Dead zone: no towers from any source |
| Nagsidorisan | 177 | 0 | Dead zone: no towers from any source |
| Natividad (Pob.) | 1,267 | 7 | Crowdsourced signal only (no registered tower) |
| Ortiz (Pob.) | 4,578 | 2 | Crowdsourced signal only (no registered tower) |
| Ribsuan | 2,448 | 1 | Crowdsourced signal only (no registered tower) |
| San Antonio | 935 | 0 | Dead zone: no towers from any source |
| San Isidro | 713 | 0 | Dead zone: no towers from any source |
| Sili | 962 | 0 | Dead zone: no towers from any source |
| Suguidan Norte | 555 | 0 | Dead zone: no towers from any source |
| Suguidan Sur | 769 | 0 | Dead zone: no towers from any source |
| Tuddingan | 1,654 | 0 | Dead zone: no towers from any source |