Dao comprises 20 barangays with an estimated population of 33,692. 14 of its barangays (70%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Aganan | 979 | 0 | Dead zone: no towers from any source |
| Agtambi | 1,609 | 1 | Crowdsourced signal only (no registered tower) |
| Agtanguay | 1,547 | 0 | Dead zone: no towers from any source |
| Balucuan | 3,124 | 4 | Crowdsourced signal only (no registered tower) |
| Bita | 727 | 0 | Dead zone: no towers from any source |
| Centro | 883 | 0 | Dead zone: no towers from any source |
| Daplas | 716 | 0 | Dead zone: no towers from any source |
| Duyoc | 2,624 | 0 | Dead zone: no towers from any source |
| Ilas Sur | 1,720 | 0 | Dead zone: no towers from any source |
| Lacaron | 1,601 | 0 | Dead zone: no towers from any source |
| Malonoy | 1,611 | 0 | Dead zone: no towers from any source |
| Manhoy | 2,188 | 2 | Crowdsourced signal only (no registered tower) |
| Mapulang Bato | 851 | 0 | Dead zone: no towers from any source |
| Matagnop | 3,663 | 1 | Crowdsourced signal only (no registered tower) |
| Nasunogan | 2,705 | 4 | Crowdsourced signal only (no registered tower) |
| Poblacion Ilawod | 1,230 | 0 | Dead zone: no towers from any source |
| Poblacion Ilaya | 1,680 | 0 | Dead zone: no towers from any source |
| Quinabcaban | 1,815 | 0 | Dead zone: no towers from any source |
| Quinayuya | 697 | 0 | Dead zone: no towers from any source |
| San Agustin (Ilas Norte) | 1,722 | 1 | Crowdsourced signal only (no registered tower) |