San Antonio comprises 14 barangays with an estimated population of 38,382. 3 of its barangays (21%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Angeles | 4,650 | 0 | Dead zone: no towers from any source |
| Antipolo (Pob.) | 1,471 | 6 | Crowdsourced signal only (no registered tower) |
| Burgos (Pob.) | 7,927 | 1 | Crowdsourced signal only (no registered tower) |
| East Dirita | 1,927 | 4 | Crowdsourced signal only (no registered tower) |
| Luna (Pob.) | 3,606 | 1 | Crowdsourced signal only (no registered tower) |
| Pundaquit | 1,778 | 4 | Crowdsourced signal only (no registered tower) |
| Rizal | 349 | 7 | Crowdsourced signal only (no registered tower) |
| San Esteban | 1,833 | 0 | Dead zone: no towers from any source |
| San Gregorio (Pob.) | 861 | 3 | Crowdsourced signal only (no registered tower) |
| San Juan (Pob.) | 617 | 0 | Dead zone: no towers from any source |
| San Miguel | 6,280 | 6 | Crowdsourced signal only (no registered tower) |
| San Nicolas (Pob.) | 4,474 | 2 | Crowdsourced signal only (no registered tower) |
| Santiago | 671 | 2 | Crowdsourced signal only (no registered tower) |
| West Dirita | 1,938 | 7 | Crowdsourced signal only (no registered tower) |