San Luis comprises 26 barangays with an estimated population of 29,430. 23 of its barangays (88%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Abiacao | 1,098 | 0 | Dead zone: no towers from any source |
| Bagong Tubig | 1,341 | 0 | Dead zone: no towers from any source |
| Balagtasin | 876 | 0 | Dead zone: no towers from any source |
| Balite | 571 | 0 | Dead zone: no towers from any source |
| Banoyo | 792 | 0 | Dead zone: no towers from any source |
| Boboy | 1,498 | 0 | Dead zone: no towers from any source |
| Bonliw | 1,554 | 0 | Dead zone: no towers from any source |
| Calumpang East | 1,320 | 0 | Dead zone: no towers from any source |
| Calumpang West | 942 | 0 | Dead zone: no towers from any source |
| Dulangan | 2,769 | 2 | Crowdsourced signal only (no registered tower) |
| Durungao | 433 | 0 | Dead zone: no towers from any source |
| Locloc | 328 | 0 | Dead zone: no towers from any source |
| Luya | 1,234 | 0 | Dead zone: no towers from any source |
| Mahabang Parang | 1,728 | 0 | Dead zone: no towers from any source |
| Manggahan | 783 | 0 | Dead zone: no towers from any source |
| Muzon | 1,099 | 2 | Crowdsourced signal only (no registered tower) |
| Poblacion | 2,199 | 1 | Crowdsourced signal only (no registered tower) |
| San Antonio | 888 | 0 | Dead zone: no towers from any source |
| San Isidro | 1,686 | 0 | Dead zone: no towers from any source |
| San Jose | 427 | 0 | Dead zone: no towers from any source |
| San Martin | 643 | 0 | Dead zone: no towers from any source |
| Santa Monica | 1,157 | 0 | Dead zone: no towers from any source |
| Taliba | 1,568 | 0 | Dead zone: no towers from any source |
| Talon | 1,128 | 0 | Dead zone: no towers from any source |
| Tejero | 1,033 | 0 | Dead zone: no towers from any source |
| Tungal | 335 | 0 | Dead zone: no towers from any source |