Basilan has 210 barangays across 12 municipalities. 194 barangays (92%) are connectivity dead zones.
| Municipality | Barangays | Dead zones |
|---|---|---|
| Akbar | 9 | 9 (100%) |
| Al-Barka | 16 | 16 (100%) |
| City of Lamitan | 45 | 29 (64%) |
| Hadji Mohammad Ajul | 11 | 11 (100%) |
| Hadji Muhtamad | 10 | 10 (100%) |
| Lantawan | 25 | 25 (100%) |
| Maluso | 20 | 20 (100%) |
| Sumisip | 29 | 29 (100%) |
| Tabuan-Lasa | 12 | 12 (100%) |
| Tipo-Tipo | 11 | 11 (100%) |
| Tuburan | 10 | 10 (100%) |
| Ungkaya Pukan | 12 | 12 (100%) |