San Miguel comprises 18 barangays with an estimated population of 25,627. 16 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 |
|---|---|---|---|
| Bayongan | 1,414 | 1 | Crowdsourced signal only (no registered tower) |
| Bugang | 1,341 | 0 | Dead zone: no towers from any source |
| Cabangahan | 374 | 0 | Dead zone: no towers from any source |
| Caluasan | 257 | 0 | Dead zone: no towers from any source |
| Camanaga | 2,180 | 0 | Dead zone: no towers from any source |
| Cambangay Norte | 2,411 | 0 | Dead zone: no towers from any source |
| Capayas | 1,047 | 0 | Dead zone: no towers from any source |
| Corazon | 3,701 | 1 | Crowdsourced signal only (no registered tower) |
| Garcia | 493 | 0 | Dead zone: no towers from any source |
| Hagbuyo | 608 | 0 | Dead zone: no towers from any source |
| Kagawasan | 1,061 | 0 | Dead zone: no towers from any source |
| Mahayag | 2,282 | 0 | Dead zone: no towers from any source |
| Poblacion | 3,392 | 0 | Dead zone: no towers from any source |
| San Isidro | 1,757 | 0 | Dead zone: no towers from any source |
| San Jose | 330 | 0 | Dead zone: no towers from any source |
| San Vicente | 1,187 | 0 | Dead zone: no towers from any source |
| Santo Niño | 521 | 0 | Dead zone: no towers from any source |
| Tomoc | 1,271 | 0 | Dead zone: no towers from any source |