Alfonso Castaneda comprises 6 barangays with an estimated population of 11,647. 5 of its barangays (83%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Abuyo | 2,081 | 0 | Dead zone: no towers from any source |
| Cawayan | 483 | 0 | Dead zone: no towers from any source |
| Galintuja | 2,250 | 0 | Dead zone: no towers from any source |
| Lipuga | 1,129 | 0 | Dead zone: no towers from any source |
| Lublub (Pob.) | 4,523 | 4 | Crowdsourced signal only (no registered tower) |
| Pelaway | 1,181 | 0 | Dead zone: no towers from any source |