Sigay comprises 7 barangays with an estimated population of 2,570. 7 of its barangays (100%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Abaccan | 225 | 0 | Dead zone: no towers from any source |
| Mabileg | 455 | 0 | Dead zone: no towers from any source |
| Matallucod | 441 | 0 | Dead zone: no towers from any source |
| Poblacion (Madayaw) | 274 | 0 | Dead zone: no towers from any source |
| San Elias | 699 | 0 | Dead zone: no towers from any source |
| San Ramon | 160 | 0 | Dead zone: no towers from any source |
| Santo Rosario | 316 | 0 | Dead zone: no towers from any source |