San Gabriel comprises 15 barangays with an estimated population of 18,670. 15 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 |
|---|---|---|---|
| Amontoc | 2,827 | 0 | Dead zone: no towers from any source |
| Apayao | 764 | 0 | Dead zone: no towers from any source |
| Balbalayang | 459 | 0 | Dead zone: no towers from any source |
| Bayabas | 857 | 0 | Dead zone: no towers from any source |
| Bucao | 2,541 | 0 | Dead zone: no towers from any source |
| Bumbuneg | 2,388 | 0 | Dead zone: no towers from any source |
| Daking | 585 | 0 | Dead zone: no towers from any source |
| Lacong | 1,457 | 0 | Dead zone: no towers from any source |
| Lipay Este | 1,010 | 0 | Dead zone: no towers from any source |
| Lipay Norte | 767 | 0 | Dead zone: no towers from any source |
| Lipay Proper | 663 | 0 | Dead zone: no towers from any source |
| Lipay Sur | 761 | 0 | Dead zone: no towers from any source |
| Lon-oy | 686 | 0 | Dead zone: no towers from any source |
| Poblacion | 1,980 | 0 | Dead zone: no towers from any source |
| Polipol | 925 | 0 | Dead zone: no towers from any source |