San Miguel comprises 18 barangays with an estimated population of 52,501. 17 of its barangays (94%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bagyang | 754 | 0 | Dead zone: no towers from any source |
| Baras | 2,363 | 0 | Dead zone: no towers from any source |
| Bitaugan | 535 | 0 | Dead zone: no towers from any source |
| Bolhoon | 6,177 | 0 | Dead zone: no towers from any source |
| Calatngan | 3,018 | 0 | Dead zone: no towers from any source |
| Carromata | 2,253 | 0 | Dead zone: no towers from any source |
| Castillo | 769 | 0 | Dead zone: no towers from any source |
| Libas Gua | 1,600 | 0 | Dead zone: no towers from any source |
| Libas Sud | 3,976 | 0 | Dead zone: no towers from any source |
| Magroyong | 2,601 | 0 | Dead zone: no towers from any source |
| Mahayag (Maitum) | 3,897 | 0 | Dead zone: no towers from any source |
| Patong | 2,407 | 0 | Dead zone: no towers from any source |
| Poblacion | 5,100 | 13 | Crowdsourced signal only (no registered tower) |
| Sagbayan | 4,077 | 0 | Dead zone: no towers from any source |
| San Roque | 5,632 | 0 | Dead zone: no towers from any source |
| Siagao | 1,575 | 0 | Dead zone: no towers from any source |
| Tina | 4,960 | 0 | Dead zone: no towers from any source |
| Umalag | 807 | 0 | Dead zone: no towers from any source |