Compostela comprises 16 barangays with an estimated population of 139,450. 9 of its barangays (56%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Aurora | 3,135 | 0 | Dead zone: no towers from any source |
| Bagongon | 4,556 | 0 | Dead zone: no towers from any source |
| Gabi | 2,006 | 4 | Crowdsourced signal only (no registered tower) |
| Lagab | 1,716 | 0 | Dead zone: no towers from any source |
| Mangayon | 8,333 | 15 | Crowdsourced signal only (no registered tower) |
| Mapaca | 679 | 0 | Dead zone: no towers from any source |
| Maparat | 1,731 | 0 | Dead zone: no towers from any source |
| New Alegria | 3,579 | 0 | Dead zone: no towers from any source |
| Ngan | 6,110 | 0 | Dead zone: no towers from any source |
| Osmeña | 18,607 | 12 | Crowdsourced signal only (no registered tower) |
| Panansalan | 2,388 | 0 | Dead zone: no towers from any source |
| Poblacion | 49,333 | 17 | Crowdsourced signal only (no registered tower) |
| San Jose | 8,298 | 6 | Crowdsourced signal only (no registered tower) |
| San Miguel | 22,663 | 0 | Dead zone: no towers from any source |
| Siocon | 3,230 | 1 | Crowdsourced signal only (no registered tower) |
| Tamia | 3,086 | 6 | Crowdsourced signal only (no registered tower) |