Lazi comprises 18 barangays with an estimated population of 21,591. 10 of its barangays (56%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Campalanas | 1,471 | 3 | Crowdsourced signal only (no registered tower) |
| Cangclaran | 1,165 | 2 | Crowdsourced signal only (no registered tower) |
| Cangomantong | 1,133 | 3 | Crowdsourced signal only (no registered tower) |
| Capalasanan | 1,739 | 0 | Dead zone: no towers from any source |
| Catamboan (Pob.) | 2,184 | 1 | Crowdsourced signal only (no registered tower) |
| Gabayan | 2,295 | 0 | Dead zone: no towers from any source |
| Kimba | 815 | 0 | Dead zone: no towers from any source |
| Kinamandagan | 1,169 | 0 | Dead zone: no towers from any source |
| Lower Cabangcalan | 584 | 0 | Dead zone: no towers from any source |
| Nagerong | 1,211 | 1 | Verified coverage (NTC + crowdsourced) |
| Po-o | 1,399 | 0 | Dead zone: no towers from any source |
| Simacolong | 1,239 | 0 | Dead zone: no towers from any source |
| Tagmanocan | 1,081 | 0 | Dead zone: no towers from any source |
| Talayong | 484 | 0 | Dead zone: no towers from any source |
| Tigbawan (Pob.) | 1,264 | 3 | Verified coverage (NTC + crowdsourced) |
| Tignao | 1,044 | 1 | Crowdsourced signal only (no registered tower) |
| Upper Cabangcalan | 539 | 1 | Registered tower only (not crowd-verified) |
| Ytaya | 775 | 0 | Dead zone: no towers from any source |