Columbio comprises 16 barangays with an estimated population of 30,433. 13 of its barangays (81%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bantangan (Lasak) | 1,725 | 0 | Dead zone: no towers from any source |
| Datablao | 766 | 0 | Dead zone: no towers from any source |
| Eday | 523 | 0 | Dead zone: no towers from any source |
| Elbebe | 422 | 0 | Dead zone: no towers from any source |
| Lasak | 754 | 0 | Dead zone: no towers from any source |
| Libertad | 5,448 | 1 | Crowdsourced signal only (no registered tower) |
| Lomoyon | 354 | 0 | Dead zone: no towers from any source |
| Makat (Sumali Pas) | 2,219 | 0 | Dead zone: no towers from any source |
| Maligaya | 1,805 | 0 | Dead zone: no towers from any source |
| Mayo | 713 | 0 | Dead zone: no towers from any source |
| Natividad | 5,839 | 0 | Dead zone: no towers from any source |
| Poblacion | 2,363 | 3 | Crowdsourced signal only (no registered tower) |
| Polomolok | 391 | 0 | Dead zone: no towers from any source |
| Sinapulan | 967 | 0 | Dead zone: no towers from any source |
| Sucob | 299 | 0 | Dead zone: no towers from any source |
| Telafas | 5,845 | 1 | Crowdsourced signal only (no registered tower) |