San Jacinto comprises 19 barangays with an estimated population of 55,325. 12 of its barangays (63%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Awai | 1,569 | 0 | Dead zone: no towers from any source |
| Bagong Pag-asa (Poblacion East) | 1,976 | 0 | Dead zone: no towers from any source |
| Bolo | 2,365 | 0 | Dead zone: no towers from any source |
| Capaoay (Pob.) | 1,135 | 0 | Dead zone: no towers from any source |
| Casibong | 4,641 | 0 | Dead zone: no towers from any source |
| Guibel | 1,642 | 4 | Crowdsourced signal only (no registered tower) |
| Imelda (Decrito) | 2,790 | 0 | Dead zone: no towers from any source |
| Labney | 3,653 | 2 | Crowdsourced signal only (no registered tower) |
| Lobong | 5,429 | 2 | Crowdsourced signal only (no registered tower) |
| Macayug | 3,064 | 1 | Crowdsourced signal only (no registered tower) |
| Magsaysay (Capay) | 153 | 0 | Dead zone: no towers from any source |
| San Guillermo (Poblacion West) | 285 | 0 | Dead zone: no towers from any source |
| San Jose | 3,646 | 2 | Crowdsourced signal only (no registered tower) |
| San Juan | 2,240 | 0 | Dead zone: no towers from any source |
| San Roque | 3,650 | 0 | Dead zone: no towers from any source |
| San Vicente | 9,950 | 7 | Crowdsourced signal only (no registered tower) |
| Santa Cruz | 479 | 0 | Dead zone: no towers from any source |
| Santa Maria | 4,596 | 4 | Crowdsourced signal only (no registered tower) |
| Santo Tomas | 2,062 | 0 | Dead zone: no towers from any source |