Sigma comprises 21 barangays with an estimated population of 31,305. 13 of its barangays (62%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Acbo | 1,715 | 4 | Crowdsourced signal only (no registered tower) |
| Amaga | 2,094 | 4 | Crowdsourced signal only (no registered tower) |
| Balucuan | 1,136 | 0 | Dead zone: no towers from any source |
| Bangonbangon | 1,139 | 0 | Dead zone: no towers from any source |
| Capuyhan | 253 | 0 | Dead zone: no towers from any source |
| Cogon | 1,161 | 0 | Dead zone: no towers from any source |
| Dayhagon | 819 | 7 | Crowdsourced signal only (no registered tower) |
| Guintas | 676 | 2 | Crowdsourced signal only (no registered tower) |
| Malapad Cogon | 947 | 0 | Dead zone: no towers from any source |
| Mangoso | 2,712 | 0 | Dead zone: no towers from any source |
| Mansacul | 893 | 0 | Dead zone: no towers from any source |
| Matangcong | 1,101 | 0 | Dead zone: no towers from any source |
| Matinabus | 1,283 | 0 | Dead zone: no towers from any source |
| Mianay | 3,838 | 1 | Crowdsourced signal only (no registered tower) |
| Oyong | 1,317 | 0 | Dead zone: no towers from any source |
| Pagbunitan | 1,155 | 0 | Dead zone: no towers from any source |
| Parian | 3,409 | 1 | Crowdsourced signal only (no registered tower) |
| Pinamalatican | 918 | 0 | Dead zone: no towers from any source |
| Poblacion Norte | 1,422 | 0 | Dead zone: no towers from any source |
| Poblacion Sur | 2,080 | 11 | Crowdsourced signal only (no registered tower) |
| Tawog | 1,237 | 3 | Crowdsourced signal only (no registered tower) |