Besao comprises 14 barangays with an estimated population of 9,558. 13 of its barangays (93%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Agawa | 865 | 0 | Dead zone: no towers from any source |
| Ambaguio | 574 | 0 | Dead zone: no towers from any source |
| Banguitan | 1,098 | 0 | Dead zone: no towers from any source |
| Besao East (Besao Proper) | 107 | 0 | Dead zone: no towers from any source |
| Besao West | 120 | 0 | Dead zone: no towers from any source |
| Catengan | 1,512 | 0 | Dead zone: no towers from any source |
| Gueday | 764 | 0 | Dead zone: no towers from any source |
| Kin-iway (Pob.) | 735 | 2 | Crowdsourced signal only (no registered tower) |
| Lacmaan | 799 | 0 | Dead zone: no towers from any source |
| Laylaya | 773 | 0 | Dead zone: no towers from any source |
| Padangan | 639 | 0 | Dead zone: no towers from any source |
| Payeo | 418 | 0 | Dead zone: no towers from any source |
| Suquib | 190 | 0 | Dead zone: no towers from any source |
| Tamboan | 964 | 0 | Dead zone: no towers from any source |