Gainza comprises 8 barangays with an estimated population of 13,665. 6 of its barangays (75%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Cagbunga | 3,056 | 0 | Dead zone: no towers from any source |
| Dahilig | 1,574 | 0 | Dead zone: no towers from any source |
| District I (Pob.) | 1,281 | 0 | Dead zone: no towers from any source |
| District II (Pob.) | 1,405 | 0 | Dead zone: no towers from any source |
| Loob | 1,390 | 1 | Crowdsourced signal only (no registered tower) |
| Malbong | 980 | 0 | Dead zone: no towers from any source |
| Namuat | 625 | 0 | Dead zone: no towers from any source |
| Sampaloc | 3,354 | 1 | Crowdsourced signal only (no registered tower) |