Lagonglong comprises 10 barangays with an estimated population of 21,406. 3 of its barangays (30%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Banglay | 1,765 | 0 | Dead zone: no towers from any source |
| Dampil | 1,764 | 2 | Verified coverage (NTC + crowdsourced) |
| Gaston | 893 | 0 | Dead zone: no towers from any source |
| Kabulawan | 2,646 | 5 | Crowdsourced signal only (no registered tower) |
| Kauswagan | 2,598 | 10 | Crowdsourced signal only (no registered tower) |
| Lumbo | 2,376 | 1 | Crowdsourced signal only (no registered tower) |
| Manaol | 3,097 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion | 2,621 | 3 | Verified coverage (NTC + crowdsourced) |
| Tabok | 2,114 | 1 | Crowdsourced signal only (no registered tower) |
| Umagos | 1,532 | 0 | Dead zone: no towers from any source |