Zamboanga del Sur has 782 barangays across 28 municipalities. 568 barangays (73%) are connectivity dead zones.
| Municipality | Barangays | Dead zones |
|---|---|---|
| Aurora | 44 | 35 (80%) |
| Bayog | 28 | 28 (100%) |
| Dimataling | 24 | 20 (83%) |
| Dinas | 30 | 26 (87%) |
| Dumalinao | 30 | 20 (67%) |
| Dumingag | 44 | 40 (91%) |
| Guipos | 17 | 14 (82%) |
| Josefina | 14 | 12 (86%) |
| Kumalarang | 18 | 11 (61%) |
| Labangan | 25 | 13 (52%) |
| Lakewood | 14 | 11 (79%) |
| Lapuyan | 26 | 24 (92%) |
| Mahayag | 29 | 29 (100%) |
| Margosatubig | 17 | 16 (94%) |
| Midsalip | 33 | 31 (94%) |
| Molave | 25 | 18 (72%) |
| Pagadian City (Capital) | 54 | 21 (39%) |
| Pitogo | 15 | 14 (93%) |
| Ramon Magsaysay (Liargo) | 27 | 22 (81%) |
| San Miguel | 18 | 14 (78%) |
| San Pablo | 28 | 27 (96%) |
| Sominot (Don Mariano Marcos) | 18 | 17 (94%) |
| Tabina | 15 | 15 (100%) |
| Tambulig | 31 | 22 (71%) |
| Tigbao | 18 | 12 (67%) |
| Tukuran | 25 | 19 (76%) |
| Vincenzo A. Sagun | 14 | 13 (93%) |
| Zamboanga City | 101 | 24 (24%) |