Cantilan comprises 17 barangays with an estimated population of 34,402. 11 of its barangays (65%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bugsukan | 170 | 0 | Dead zone: no towers from any source |
| Buntalid | 1,674 | 0 | Dead zone: no towers from any source |
| Cabangahan | 368 | 0 | Dead zone: no towers from any source |
| Cabas-an | 2,473 | 0 | Dead zone: no towers from any source |
| Calagdaan | 3,318 | 0 | Dead zone: no towers from any source |
| Consuelo | 1,038 | 0 | Dead zone: no towers from any source |
| General Island | 540 | 0 | Dead zone: no towers from any source |
| Lininti-an (Pob.) | 1,898 | 3 | Crowdsourced signal only (no registered tower) |
| Lobo | 776 | 0 | Dead zone: no towers from any source |
| Magasang | 2,540 | 1 | Crowdsourced signal only (no registered tower) |
| Magosilom (Pob.) | 7,080 | 7 | Crowdsourced signal only (no registered tower) |
| Pag-Antayan | 3,093 | 1 | Crowdsourced signal only (no registered tower) |
| Palasao | 509 | 16 | Crowdsourced signal only (no registered tower) |
| Parang | 3,817 | 0 | Dead zone: no towers from any source |
| San Pedro | 3,883 | 19 | Crowdsourced signal only (no registered tower) |
| Tapi | 163 | 0 | Dead zone: no towers from any source |
| Tigabong | 1,062 | 0 | Dead zone: no towers from any source |