Salay comprises 18 barangays with an estimated population of 48,329. 12 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 |
|---|---|---|---|
| Alipuaton | 3,986 | 0 | Dead zone: no towers from any source |
| Ampenican | 1,807 | 0 | Dead zone: no towers from any source |
| Bunal | 765 | 0 | Dead zone: no towers from any source |
| Casulog | 4,867 | 1 | Verified coverage (NTC + crowdsourced) |
| Dinagsaan | 549 | 0 | Dead zone: no towers from any source |
| Guinalaban | 2,206 | 0 | Dead zone: no towers from any source |
| Ili-ilihon | 1,807 | 0 | Dead zone: no towers from any source |
| Inobulan | 3,844 | 1 | Verified coverage (NTC + crowdsourced) |
| Looc | 3,342 | 1 | Crowdsourced signal only (no registered tower) |
| Matampa | 538 | 0 | Dead zone: no towers from any source |
| Membuli | 3,927 | 0 | Dead zone: no towers from any source |
| Poblacion | 8,091 | 1 | Verified coverage (NTC + crowdsourced) |
| Salagsag | 609 | 0 | Dead zone: no towers from any source |
| Salay River I | 4,408 | 2 | Crowdsourced signal only (no registered tower) |
| Salay River II | 1,435 | 0 | Dead zone: no towers from any source |
| Saray | 3,194 | 0 | Dead zone: no towers from any source |
| Tinagaan | 1,547 | 0 | Dead zone: no towers from any source |
| Yungod | 1,407 | 1 | Registered tower only (not crowd-verified) |