Surigao del Sur has 309 barangays across 19 municipalities. 230 barangays (74%) are connectivity dead zones.
| Municipality | Barangays | Dead zones |
|---|---|---|
| Barobo | 21 | 13 (62%) |
| Bayabas | 7 | 5 (71%) |
| Cagwait | 11 | 9 (82%) |
| Cantilan | 17 | 11 (65%) |
| Carmen | 8 | 8 (100%) |
| Carrascal | 14 | 7 (50%) |
| City of Bislig | 24 | 13 (54%) |
| City of Tandag (Capital) | 21 | 12 (57%) |
| Cortes | 12 | 10 (83%) |
| Hinatuan | 24 | 15 (62%) |
| Lanuza | 13 | 7 (54%) |
| Lianga | 13 | 11 (85%) |
| Lingig | 18 | 18 (100%) |
| Madrid | 14 | 13 (93%) |
| Marihatag | 12 | 10 (83%) |
| San Agustin | 13 | 8 (62%) |
| San Miguel | 18 | 17 (94%) |
| Tagbina | 25 | 21 (84%) |
| Tago | 24 | 22 (92%) |