Irosin comprises 28 barangays with an estimated population of 58,501. 15 of its barangays (54%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bacolod (Pob.) | 3,309 | 1 | Crowdsourced signal only (no registered tower) |
| Bagsangan | 3,810 | 0 | Dead zone: no towers from any source |
| Batang | 1,702 | 0 | Dead zone: no towers from any source |
| Bolos | 738 | 5 | Crowdsourced signal only (no registered tower) |
| Buenavista | 1,479 | 3 | Crowdsourced signal only (no registered tower) |
| Bulawan | 1,032 | 0 | Dead zone: no towers from any source |
| Carriedo | 4,045 | 0 | Dead zone: no towers from any source |
| Casini | 1,435 | 1 | Crowdsourced signal only (no registered tower) |
| Cawayan | 611 | 1 | Crowdsourced signal only (no registered tower) |
| Cogon | 1,105 | 0 | Dead zone: no towers from any source |
| Gabao | 3,587 | 0 | Dead zone: no towers from any source |
| Gulang-Gulang | 2,668 | 2 | Crowdsourced signal only (no registered tower) |
| Gumapia | 1,317 | 0 | Dead zone: no towers from any source |
| Liang | 1,140 | 1 | Crowdsourced signal only (no registered tower) |
| Macawayan | 2,236 | 1 | Crowdsourced signal only (no registered tower) |
| Mapaso | 1,164 | 0 | Dead zone: no towers from any source |
| Monbon | 4,309 | 2 | Crowdsourced signal only (no registered tower) |
| Patag | 3,499 | 0 | Dead zone: no towers from any source |
| Salvacion | 1,077 | 0 | Dead zone: no towers from any source |
| San Agustin (Pob.) | 2,769 | 1 | Crowdsourced signal only (no registered tower) |
| San Isidro | 351 | 0 | Dead zone: no towers from any source |
| San Juan (Pob.) | 1,646 | 0 | Dead zone: no towers from any source |
| San Julian (Pob.) | 2,281 | 5 | Crowdsourced signal only (no registered tower) |
| San Pedro | 3,686 | 0 | Dead zone: no towers from any source |
| Santo Domingo (Lamboon) | 1,185 | 16 | Crowdsourced signal only (no registered tower) |
| Tabon-Tabon | 2,151 | 1 | Crowdsourced signal only (no registered tower) |
| Tinampo | 1,368 | 0 | Dead zone: no towers from any source |
| Tongdol | 2,801 | 0 | Dead zone: no towers from any source |