San Clemente comprises 12 barangays with an estimated population of 13,347. 10 of its barangays (83%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Balloc | 1,116 | 0 | Dead zone: no towers from any source |
| Bamban | 357 | 0 | Dead zone: no towers from any source |
| Casipo | 1,543 | 0 | Dead zone: no towers from any source |
| Catagudingan | 1,230 | 4 | Crowdsourced signal only (no registered tower) |
| Daldalayap | 392 | 0 | Dead zone: no towers from any source |
| Doclong 1 | 1,400 | 0 | Dead zone: no towers from any source |
| Doclong 2 | 1,738 | 0 | Dead zone: no towers from any source |
| Maasin | 1,454 | 0 | Dead zone: no towers from any source |
| Nagsabaran | 1,458 | 4 | Crowdsourced signal only (no registered tower) |
| Pit-ao | 1,501 | 0 | Dead zone: no towers from any source |
| Poblacion Norte | 641 | 0 | Dead zone: no towers from any source |
| Poblacion Sur | 517 | 0 | Dead zone: no towers from any source |