Cuartero comprises 22 barangays with an estimated population of 25,363. 17 of its barangays (77%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Agcabugao | 706 | 0 | Dead zone: no towers from any source |
| Agdahon | 1,635 | 0 | Dead zone: no towers from any source |
| Agnaga | 875 | 0 | Dead zone: no towers from any source |
| Angub | 995 | 0 | Dead zone: no towers from any source |
| Balingasag | 605 | 0 | Dead zone: no towers from any source |
| Bito-on Ilawod | 881 | 13 | Crowdsourced signal only (no registered tower) |
| Bito-on Ilaya | 1,357 | 3 | Crowdsourced signal only (no registered tower) |
| Bun-od | 443 | 0 | Dead zone: no towers from any source |
| Carataya | 907 | 0 | Dead zone: no towers from any source |
| Lunayan | 525 | 0 | Dead zone: no towers from any source |
| Mahabang Sapa | 1,063 | 0 | Dead zone: no towers from any source |
| Mahunodhunod | 867 | 0 | Dead zone: no towers from any source |
| Maindang | 550 | 0 | Dead zone: no towers from any source |
| Mainit | 1,256 | 0 | Dead zone: no towers from any source |
| Malagab-i | 1,692 | 0 | Dead zone: no towers from any source |
| Nagba | 1,438 | 0 | Dead zone: no towers from any source |
| Poblacion Ilawod | 611 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion Ilaya | 1,566 | 2 | Crowdsourced signal only (no registered tower) |
| Poblacion Takas | 2,316 | 15 | Crowdsourced signal only (no registered tower) |
| Puti-an | 2,051 | 0 | Dead zone: no towers from any source |
| San Antonio | 1,930 | 0 | Dead zone: no towers from any source |
| Sinabsaban | 1,094 | 0 | Dead zone: no towers from any source |