Hernani comprises 13 barangays with an estimated population of 6,729. 6 of its barangays (46%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Barangay 1 (Pob.) | 111 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay 2 (Pob.) | 273 | 0 | Dead zone: no towers from any source |
| Barangay 3 (Pob.) | 640 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay 4 (Pob.) | 248 | 0 | Dead zone: no towers from any source |
| Batang | 363 | 1 | Crowdsourced signal only (no registered tower) |
| Cacatmonan | 417 | 0 | Dead zone: no towers from any source |
| Canciledes | 1,035 | 1 | Crowdsourced signal only (no registered tower) |
| Carmen | 916 | 3 | Crowdsourced signal only (no registered tower) |
| Garawon | 356 | 0 | Dead zone: no towers from any source |
| Nagaja | 268 | 0 | Dead zone: no towers from any source |
| Padang | 958 | 2 | Crowdsourced signal only (no registered tower) |
| San Isidro | 525 | 0 | Dead zone: no towers from any source |
| San Miguel | 619 | 1 | Crowdsourced signal only (no registered tower) |