Sudipen comprises 17 barangays with an estimated population of 22,164. 15 of its barangays (88%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bigbiga | 1,308 | 0 | Dead zone: no towers from any source |
| Bulalaan | 763 | 0 | Dead zone: no towers from any source |
| Castro | 3,482 | 0 | Dead zone: no towers from any source |
| Duplas | 836 | 0 | Dead zone: no towers from any source |
| Ilocano | 828 | 0 | Dead zone: no towers from any source |
| Ipet | 1,705 | 6 | Crowdsourced signal only (no registered tower) |
| Maliclico | 1,318 | 0 | Dead zone: no towers from any source |
| Namaltugan | 1,988 | 0 | Dead zone: no towers from any source |
| Old Central | 836 | 0 | Dead zone: no towers from any source |
| Poblacion | 872 | 4 | Crowdsourced signal only (no registered tower) |
| Porporiket | 483 | 0 | Dead zone: no towers from any source |
| San Francisco Norte | 1,396 | 0 | Dead zone: no towers from any source |
| San Francisco Sur | 961 | 0 | Dead zone: no towers from any source |
| San Jose | 1,649 | 0 | Dead zone: no towers from any source |
| Sengngat | 1,761 | 0 | Dead zone: no towers from any source |
| Turod | 528 | 0 | Dead zone: no towers from any source |
| Up-uplas | 1,450 | 0 | Dead zone: no towers from any source |