San Andres (Calolbon) comprises 38 barangays with an estimated population of 35,818. 34 of its barangays (89%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Agojo | 790 | 0 | Dead zone: no towers from any source |
| Alibuag | 581 | 0 | Dead zone: no towers from any source |
| Asgad (Juan M. Alberto) | 1,105 | 0 | Dead zone: no towers from any source |
| Bagong Sirang | 1,107 | 0 | Dead zone: no towers from any source |
| Barihay | 172 | 0 | Dead zone: no towers from any source |
| Batong Paloway | 1,243 | 0 | Dead zone: no towers from any source |
| Belmonte (Pob.) | 1,800 | 0 | Dead zone: no towers from any source |
| Bislig | 855 | 0 | Dead zone: no towers from any source |
| Bon-ot | 2,144 | 0 | Dead zone: no towers from any source |
| Cabcab | 1,642 | 1 | Crowdsourced signal only (no registered tower) |
| Cabungahan | 699 | 0 | Dead zone: no towers from any source |
| Carangag | 1,297 | 0 | Dead zone: no towers from any source |
| Catagbacan | 1,050 | 0 | Dead zone: no towers from any source |
| Codon | 1,374 | 0 | Dead zone: no towers from any source |
| Comagaycay | 473 | 0 | Dead zone: no towers from any source |
| Datag | 723 | 0 | Dead zone: no towers from any source |
| Divino Rostro (Pob.) | 700 | 3 | Crowdsourced signal only (no registered tower) |
| Esperanza (Pob.) | 116 | 0 | Dead zone: no towers from any source |
| Hilawan | 185 | 0 | Dead zone: no towers from any source |
| Lictin | 2,089 | 3 | Crowdsourced signal only (no registered tower) |
| Lubas | 258 | 0 | Dead zone: no towers from any source |
| Manambrag | 3,265 | 0 | Dead zone: no towers from any source |
| Mayngaway | 1,131 | 0 | Dead zone: no towers from any source |
| Palawig | 1,547 | 0 | Dead zone: no towers from any source |
| Puting Baybay | 114 | 0 | Dead zone: no towers from any source |
| Rizal | 1,083 | 0 | Dead zone: no towers from any source |
| Salvacion (Pob.) | 130 | 0 | Dead zone: no towers from any source |
| San Isidro | 1,122 | 0 | Dead zone: no towers from any source |
| San Jose | 711 | 0 | Dead zone: no towers from any source |
| San Roque (Pob.) | 55 | 0 | Dead zone: no towers from any source |
| San Vicente | 785 | 0 | Dead zone: no towers from any source |
| Santa Cruz (Pob.) | 173 | 0 | Dead zone: no towers from any source |
| Sapang Palay (Pob.) | 533 | 0 | Dead zone: no towers from any source |
| Tibang | 357 | 0 | Dead zone: no towers from any source |
| Timbaan | 1,554 | 1 | Crowdsourced signal only (no registered tower) |
| Tominawog | 607 | 0 | Dead zone: no towers from any source |
| Wagdas (Pob.) | 886 | 0 | Dead zone: no towers from any source |
| Yocti | 1,362 | 0 | Dead zone: no towers from any source |