Sanchez-Mira comprises 18 barangays with an estimated population of 22,529. 14 of its barangays (78%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bangan | 1,836 | 0 | Dead zone: no towers from any source |
| Callungan | 1,434 | 0 | Dead zone: no towers from any source |
| Centro I (Pob.) | 1,584 | 0 | Dead zone: no towers from any source |
| Centro II (Pob.) | 2,510 | 3 | Crowdsourced signal only (no registered tower) |
| Dacal | 793 | 0 | Dead zone: no towers from any source |
| Dagueray | 934 | 2 | Crowdsourced signal only (no registered tower) |
| Dammang | 952 | 0 | Dead zone: no towers from any source |
| Kittag | 369 | 0 | Dead zone: no towers from any source |
| Langagan | 1,998 | 9 | Crowdsourced signal only (no registered tower) |
| Magacan | 1,227 | 0 | Dead zone: no towers from any source |
| Marzan | 686 | 0 | Dead zone: no towers from any source |
| Masisit | 1,583 | 0 | Dead zone: no towers from any source |
| Nagrangtayan | 582 | 0 | Dead zone: no towers from any source |
| Namuac | 2,272 | 5 | Crowdsourced signal only (no registered tower) |
| San Andres | 1,623 | 0 | Dead zone: no towers from any source |
| Santiago | 255 | 0 | Dead zone: no towers from any source |
| Santor | 686 | 0 | Dead zone: no towers from any source |
| Tokitok | 1,205 | 0 | Dead zone: no towers from any source |