Lumban comprises 16 barangays with an estimated population of 38,317. 7 of its barangays (44%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bagong Silang | 1,728 | 4 | Crowdsourced signal only (no registered tower) |
| Balimbingan (Pob.) | 232 | 0 | Dead zone: no towers from any source |
| Balubad | 2,703 | 3 | Crowdsourced signal only (no registered tower) |
| Caliraya | 399 | 0 | Dead zone: no towers from any source |
| Concepcion | 4,241 | 0 | Dead zone: no towers from any source |
| Lewin | 4,274 | 17 | Crowdsourced signal only (no registered tower) |
| Maracta (Pob.) | 309 | 0 | Dead zone: no towers from any source |
| Maytalang I | 3,348 | 19 | Crowdsourced signal only (no registered tower) |
| Maytalang II | 6,098 | 3 | Crowdsourced signal only (no registered tower) |
| Primera Parang (Pob.) | 349 | 10 | Crowdsourced signal only (no registered tower) |
| Primera Pulo (Pob.) | 521 | 0 | Dead zone: no towers from any source |
| Salac (Pob.) | 269 | 2 | Crowdsourced signal only (no registered tower) |
| Santo Niño (Pob.) | 380 | 0 | Dead zone: no towers from any source |
| Segunda Parang (Pob.) | 138 | 0 | Dead zone: no towers from any source |
| Segunda Pulo (Pob.) | 749 | 2 | Crowdsourced signal only (no registered tower) |
| Wawa | 12,579 | 4 | Crowdsourced signal only (no registered tower) |