Sarangani has 142 barangays across 7 municipalities. 93 barangays (65%) are connectivity dead zones.
| Municipality | Barangays | Dead zones |
|---|---|---|
| Alabel (Capital) | 14 | 7 (50%) |
| Glan | 31 | 19 (61%) |
| Kiamba | 19 | 11 (58%) |
| Maasim | 16 | 11 (69%) |
| Maitum | 19 | 14 (74%) |
| Malapatan | 12 | 10 (83%) |
| Malungon | 31 | 21 (68%) |