Sto. Tomas comprises 7 barangays with an estimated population of 24,181. 2 of its barangays (29%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Moras de la Paz | 1,570 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion | 277 | 0 | Dead zone: no towers from any source |
| San Bartolome | 487 | 0 | Dead zone: no towers from any source |
| San Matias | 13,963 | 11 | Crowdsourced signal only (no registered tower) |
| San Vicente | 1,137 | 1 | Crowdsourced signal only (no registered tower) |
| Santo Rosario (Pau) | 5,597 | 14 | Crowdsourced signal only (no registered tower) |
| Sapa (Santo Niño) | 1,150 | 1 | Crowdsourced signal only (no registered tower) |