Sagay comprises 9 barangays with an estimated population of 12,113. 6 of its barangays (67%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alangilan | 1,392 | 0 | Dead zone: no towers from any source |
| Bacnit | 1,016 | 0 | Dead zone: no towers from any source |
| Balite | 444 | 0 | Dead zone: no towers from any source |
| Bonbon | 1,121 | 2 | Crowdsourced signal only (no registered tower) |
| Bugang | 1,009 | 1 | Crowdsourced signal only (no registered tower) |
| Cuna | 608 | 0 | Dead zone: no towers from any source |
| Manuyog | 1,004 | 0 | Dead zone: no towers from any source |
| Mayana | 967 | 0 | Dead zone: no towers from any source |
| Poblacion | 4,552 | 3 | Verified coverage (NTC + crowdsourced) |