San Isidro comprises 13 barangays with an estimated population of 32,982. 12 of its barangays (92%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Dacudao | 796 | 0 | Dead zone: no towers from any source |
| Datu Balong | 752 | 0 | Dead zone: no towers from any source |
| Igangon | 3,646 | 0 | Dead zone: no towers from any source |
| Kipalili | 5,081 | 0 | Dead zone: no towers from any source |
| Libuton | 1,341 | 0 | Dead zone: no towers from any source |
| Linao | 3,099 | 0 | Dead zone: no towers from any source |
| Mamangan | 2,726 | 0 | Dead zone: no towers from any source |
| Monte Dujali | 853 | 0 | Dead zone: no towers from any source |
| Pinamuno | 963 | 0 | Dead zone: no towers from any source |
| Sabangan | 6,051 | 0 | Dead zone: no towers from any source |
| San Miguel | 2,357 | 0 | Dead zone: no towers from any source |
| Santo Niño | 1,257 | 0 | Dead zone: no towers from any source |
| Sawata | 4,060 | 1 | Crowdsourced signal only (no registered tower) |