San Luis comprises 18 barangays with an estimated population of 31,145. 8 of its barangays (44%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bacong | 2,400 | 9 | Crowdsourced signal only (no registered tower) |
| Barangay I (Pob.) | 305 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay II (Pob.) | 733 | 3 | Crowdsourced signal only (no registered tower) |
| Barangay III (Pob.) | 299 | 3 | Crowdsourced signal only (no registered tower) |
| Barangay IV (Pob.) | 1,018 | 1 | Crowdsourced signal only (no registered tower) |
| Dibalo | 712 | 0 | Dead zone: no towers from any source |
| Dibayabay | 994 | 0 | Dead zone: no towers from any source |
| Dibut | 350 | 0 | Dead zone: no towers from any source |
| Dikapinisan | 2,164 | 0 | Dead zone: no towers from any source |
| Dimanayat | 1,268 | 0 | Dead zone: no towers from any source |
| Diteki | 2,850 | 0 | Dead zone: no towers from any source |
| Ditumabo | 3,014 | 0 | Dead zone: no towers from any source |
| L. Pimentel | 1,207 | 4 | Crowdsourced signal only (no registered tower) |
| Nonong Senior | 5,318 | 6 | Crowdsourced signal only (no registered tower) |
| Real | 1,793 | 0 | Dead zone: no towers from any source |
| San Isidro | 1,407 | 3 | Crowdsourced signal only (no registered tower) |
| San Jose | 559 | 4 | Crowdsourced signal only (no registered tower) |
| Zarah | 4,754 | 4 | Crowdsourced signal only (no registered tower) |