Santo Tomas comprises 10 barangays with an estimated population of 20,264. 8 of its barangays (80%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| La Luna | 728 | 0 | Dead zone: no towers from any source |
| Poblacion East | 798 | 0 | Dead zone: no towers from any source |
| Poblacion West | 1,784 | 0 | Dead zone: no towers from any source |
| Salvacion | 1,263 | 0 | Dead zone: no towers from any source |
| San Agustin | 849 | 0 | Dead zone: no towers from any source |
| San Antonio | 7,313 | 2 | Crowdsourced signal only (no registered tower) |
| San Jose | 1,838 | 0 | Dead zone: no towers from any source |
| San Marcos | 1,318 | 0 | Dead zone: no towers from any source |
| Santo Domingo | 2,668 | 0 | Dead zone: no towers from any source |
| Santo Niño | 1,705 | 1 | Crowdsourced signal only (no registered tower) |