San Jacinto comprises 21 barangays with an estimated population of 29,152. 17 of its barangays (81%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Almiñe | 1,285 | 0 | Dead zone: no towers from any source |
| Bagacay | 274 | 0 | Dead zone: no towers from any source |
| Bagahanglad | 3,785 | 0 | Dead zone: no towers from any source |
| Bartolabac | 802 | 0 | Dead zone: no towers from any source |
| Burgos | 4,069 | 0 | Dead zone: no towers from any source |
| Calipat-An | 1,987 | 0 | Dead zone: no towers from any source |
| Danao | 925 | 0 | Dead zone: no towers from any source |
| District I (Pob.) | 911 | 1 | Crowdsourced signal only (no registered tower) |
| District II (Pob.) | 2,864 | 1 | Crowdsourced signal only (no registered tower) |
| District III (Pob.) | 1,195 | 7 | Crowdsourced signal only (no registered tower) |
| District IV (Pob.) | 368 | 1 | Crowdsourced signal only (no registered tower) |
| Dorong-an Daplian | 473 | 0 | Dead zone: no towers from any source |
| Interior | 927 | 0 | Dead zone: no towers from any source |
| Jagna-an | 1,159 | 0 | Dead zone: no towers from any source |
| Luna | 951 | 0 | Dead zone: no towers from any source |
| Mabini | 1,239 | 0 | Dead zone: no towers from any source |
| Piña | 936 | 0 | Dead zone: no towers from any source |
| Roosevelt | 1,334 | 0 | Dead zone: no towers from any source |
| San Isidro | 543 | 0 | Dead zone: no towers from any source |
| Santa Rosa | 1,996 | 0 | Dead zone: no towers from any source |
| Washington | 1,129 | 0 | Dead zone: no towers from any source |