San Andres comprises 13 barangays with an estimated population of 16,242. 13 of its barangays (100%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Agpudlos | 1,286 | 0 | Dead zone: no towers from any source |
| Calunacon | 2,117 | 0 | Dead zone: no towers from any source |
| Doña Trinidad | 575 | 0 | Dead zone: no towers from any source |
| Juncarlo | 1,101 | 0 | Dead zone: no towers from any source |
| Linawan | 1,354 | 0 | Dead zone: no towers from any source |
| Mabini | 1,434 | 0 | Dead zone: no towers from any source |
| Marigondon Norte | 1,380 | 0 | Dead zone: no towers from any source |
| Marigondon Sur | 1,558 | 0 | Dead zone: no towers from any source |
| Matutuna | 1,205 | 0 | Dead zone: no towers from any source |
| Pag-Alad | 999 | 0 | Dead zone: no towers from any source |
| Poblacion | 1,085 | 0 | Dead zone: no towers from any source |
| Tan-Agan | 1,517 | 0 | Dead zone: no towers from any source |
| Victoria | 631 | 0 | Dead zone: no towers from any source |