Peñablanca comprises 24 barangays with an estimated population of 53,841. 17 of its barangays (71%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Aggugaddan | 2,640 | 0 | Dead zone: no towers from any source |
| Alimannao | 4,568 | 6 | Verified coverage (NTC + crowdsourced) |
| Baliuag | 1,884 | 0 | Dead zone: no towers from any source |
| Bical | 2,436 | 0 | Dead zone: no towers from any source |
| Bugatay | 2,064 | 1 | Crowdsourced signal only (no registered tower) |
| Buyun | 1,240 | 0 | Dead zone: no towers from any source |
| Cabasan | 1,052 | 6 | Crowdsourced signal only (no registered tower) |
| Cabbo | 3,198 | 9 | Crowdsourced signal only (no registered tower) |
| Callao | 1,237 | 0 | Dead zone: no towers from any source |
| Camasi | 3,659 | 6 | Crowdsourced signal only (no registered tower) |
| Centro (Pob.) | 1,746 | 0 | Dead zone: no towers from any source |
| Dodan | 3,257 | 3 | Crowdsourced signal only (no registered tower) |
| Lapi | 3,253 | 0 | Dead zone: no towers from any source |
| Malibabag | 731 | 0 | Dead zone: no towers from any source |
| Manga | 3,359 | 0 | Dead zone: no towers from any source |
| Minanga | 448 | 0 | Dead zone: no towers from any source |
| Nabbabalayan | 1,108 | 0 | Dead zone: no towers from any source |
| Nanguilattan | 1,750 | 1 | Crowdsourced signal only (no registered tower) |
| Nannarian | 2,126 | 0 | Dead zone: no towers from any source |
| Parabba | 2,398 | 0 | Dead zone: no towers from any source |
| Patagueleg | 359 | 0 | Dead zone: no towers from any source |
| Quibal | 5,564 | 0 | Dead zone: no towers from any source |
| San Roque (Litto) | 2,039 | 0 | Dead zone: no towers from any source |
| Sisim | 1,725 | 0 | Dead zone: no towers from any source |