Sierra Bullones comprises 22 barangays with an estimated population of 21,680. 21 of its barangays (95%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Abachanan | 1,296 | 0 | Dead zone: no towers from any source |
| Anibongan | 715 | 0 | Dead zone: no towers from any source |
| Bugsoc | 2,609 | 0 | Dead zone: no towers from any source |
| Cahayag | 300 | 0 | Dead zone: no towers from any source |
| Canlangit | 1,473 | 0 | Dead zone: no towers from any source |
| Canta-ub | 403 | 0 | Dead zone: no towers from any source |
| Casilay | 434 | 0 | Dead zone: no towers from any source |
| Danicop | 1,193 | 0 | Dead zone: no towers from any source |
| Dusita | 281 | 0 | Dead zone: no towers from any source |
| La Union | 620 | 0 | Dead zone: no towers from any source |
| Lataban | 254 | 0 | Dead zone: no towers from any source |
| Magsaysay | 607 | 0 | Dead zone: no towers from any source |
| Man-od | 2,353 | 0 | Dead zone: no towers from any source |
| Matin-ao | 415 | 0 | Dead zone: no towers from any source |
| Poblacion | 2,164 | 0 | Dead zone: no towers from any source |
| Salvador | 1,852 | 0 | Dead zone: no towers from any source |
| San Agustin | 521 | 1 | Crowdsourced signal only (no registered tower) |
| San Isidro | 827 | 0 | Dead zone: no towers from any source |
| San Jose | 544 | 0 | Dead zone: no towers from any source |
| San Juan | 569 | 0 | Dead zone: no towers from any source |
| Santa Cruz | 1,315 | 0 | Dead zone: no towers from any source |
| Villa Garcia | 935 | 0 | Dead zone: no towers from any source |