Sumilao comprises 10 barangays with an estimated population of 38,591. 6 of its barangays (60%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Culasi | 970 | 0 | Dead zone: no towers from any source |
| Kisolon | 19,079 | 8 | Crowdsourced signal only (no registered tower) |
| Licoan | 749 | 0 | Dead zone: no towers from any source |
| Lupiagan | 1,115 | 0 | Dead zone: no towers from any source |
| Ocasion | 879 | 0 | Dead zone: no towers from any source |
| Poblacion | 2,091 | 0 | Dead zone: no towers from any source |
| Puntian | 2,136 | 0 | Dead zone: no towers from any source |
| San Roque | 4,013 | 4 | Crowdsourced signal only (no registered tower) |
| San Vicente | 4,751 | 9 | Crowdsourced signal only (no registered tower) |
| Vista Villa | 2,808 | 1 | Crowdsourced signal only (no registered tower) |