Lasam comprises 30 barangays with an estimated population of 39,521. 26 of its barangays (87%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Aggunetan | 1,483 | 0 | Dead zone: no towers from any source |
| Alannay | 1,981 | 0 | Dead zone: no towers from any source |
| Battalan | 1,557 | 0 | Dead zone: no towers from any source |
| Cabatacan East (Duldugan*) | 937 | 0 | Dead zone: no towers from any source |
| Cabatacan West | 1,428 | 0 | Dead zone: no towers from any source |
| Calapangan Norte | 785 | 0 | Dead zone: no towers from any source |
| Calapangan Sur | 859 | 0 | Dead zone: no towers from any source |
| Callao Norte | 1,457 | 0 | Dead zone: no towers from any source |
| Callao Sur | 882 | 0 | Dead zone: no towers from any source |
| Cataliganan | 1,170 | 0 | Dead zone: no towers from any source |
| Centro I (Pob.) | 1,478 | 1 | Crowdsourced signal only (no registered tower) |
| Centro II (Pob.) | 864 | 1 | Crowdsourced signal only (no registered tower) |
| Centro III (Pob.) | 2,997 | 0 | Dead zone: no towers from any source |
| Finugo Norte | 581 | 0 | Dead zone: no towers from any source |
| Gabun | 1,309 | 0 | Dead zone: no towers from any source |
| Ignacio Jurado (Finugu Sur) | 1,347 | 1 | Crowdsourced signal only (no registered tower) |
| Magsaysay | 1,535 | 2 | Crowdsourced signal only (no registered tower) |
| Malinta | 1,340 | 0 | Dead zone: no towers from any source |
| Minanga Norte | 328 | 0 | Dead zone: no towers from any source |
| Minanga Sur | 793 | 0 | Dead zone: no towers from any source |
| Nabannagan East | 745 | 0 | Dead zone: no towers from any source |
| Nabannagan West | 3,230 | 0 | Dead zone: no towers from any source |
| New Orlins | 1,240 | 0 | Dead zone: no towers from any source |
| Nicolas Agatep | 610 | 0 | Dead zone: no towers from any source |
| Peru | 2,429 | 0 | Dead zone: no towers from any source |
| San Pedro | 2,955 | 0 | Dead zone: no towers from any source |
| Sicalao | 1,093 | 0 | Dead zone: no towers from any source |
| Tagao | 370 | 0 | Dead zone: no towers from any source |
| Tucalan Passing | 667 | 0 | Dead zone: no towers from any source |
| Viga | 1,071 | 0 | Dead zone: no towers from any source |