Peñarrubia comprises 9 barangays with an estimated population of 7,203. 7 of its barangays (78%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Dumayco | 1,194 | 0 | Dead zone: no towers from any source |
| Lusuac | 1,360 | 2 | Crowdsourced signal only (no registered tower) |
| Malamsit (Pau-Malamsit) | 952 | 0 | Dead zone: no towers from any source |
| Namarabar | 560 | 0 | Dead zone: no towers from any source |
| Patiao | 484 | 0 | Dead zone: no towers from any source |
| Poblacion | 652 | 0 | Dead zone: no towers from any source |
| Riang (Tiang) | 1,169 | 1 | Crowdsourced signal only (no registered tower) |
| Santa Rosa | 335 | 0 | Dead zone: no towers from any source |
| Tattawa | 497 | 0 | Dead zone: no towers from any source |