Altavas comprises 14 barangays with an estimated population of 23,119. 8 of its barangays (57%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Cabangila | 1,647 | 15 | Crowdsourced signal only (no registered tower) |
| Cabugao | 1,626 | 3 | Crowdsourced signal only (no registered tower) |
| Catmon | 704 | 0 | Dead zone: no towers from any source |
| Dalipdip | 655 | 0 | Dead zone: no towers from any source |
| Ginictan | 911 | 0 | Dead zone: no towers from any source |
| Linayasan | 1,863 | 5 | Crowdsourced signal only (no registered tower) |
| Lumaynay | 1,605 | 0 | Dead zone: no towers from any source |
| Lupo | 2,240 | 0 | Dead zone: no towers from any source |
| Man-up | 1,070 | 1 | Crowdsourced signal only (no registered tower) |
| Odiong | 2,977 | 5 | Crowdsourced signal only (no registered tower) |
| Poblacion | 4,503 | 7 | Crowdsourced signal only (no registered tower) |
| Quinasay-an | 490 | 0 | Dead zone: no towers from any source |
| Talon | 1,509 | 0 | Dead zone: no towers from any source |
| Tibiao | 1,319 | 0 | Dead zone: no towers from any source |