San Francisco comprises 15 barangays with an estimated population of 47,409. 7 of its barangays (47%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Cabunga-an | 1,941 | 0 | Dead zone: no towers from any source |
| Campo | 2,206 | 3 | Crowdsourced signal only (no registered tower) |
| Consuelo | 5,605 | 4 | Crowdsourced signal only (no registered tower) |
| Esperanza | 4,152 | 0 | Dead zone: no towers from any source |
| Himensulan | 1,872 | 1 | Crowdsourced signal only (no registered tower) |
| Montealegre | 1,613 | 0 | Dead zone: no towers from any source |
| Northern Poblacion | 5,261 | 1 | Crowdsourced signal only (no registered tower) |
| San Isidro | 2,869 | 1 | Crowdsourced signal only (no registered tower) |
| Santa Cruz | 4,409 | 0 | Dead zone: no towers from any source |
| Santiago | 1,470 | 8 | Crowdsourced signal only (no registered tower) |
| Sonog | 4,038 | 0 | Dead zone: no towers from any source |
| Southern Poblacion | 2,934 | 0 | Dead zone: no towers from any source |
| Unidos | 768 | 3 | Crowdsourced signal only (no registered tower) |
| Union | 5,066 | 2 | Crowdsourced signal only (no registered tower) |
| Western Poblacion | 3,205 | 0 | Dead zone: no towers from any source |