San Lorenzo comprises 12 barangays with an estimated population of 27,303. 12 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 |
|---|---|---|---|
| Aguilar | 2,179 | 0 | Dead zone: no towers from any source |
| Cabano | 4,846 | 0 | Dead zone: no towers from any source |
| Cabungahan | 1,158 | 0 | Dead zone: no towers from any source |
| Constancia | 4,698 | 0 | Dead zone: no towers from any source |
| Gaban | 2,356 | 0 | Dead zone: no towers from any source |
| Igcawayan | 1,924 | 0 | Dead zone: no towers from any source |
| M. Chavez | 2,751 | 0 | Dead zone: no towers from any source |
| San Enrique (Lebas) | 1,711 | 0 | Dead zone: no towers from any source |
| Sapal | 1,576 | 0 | Dead zone: no towers from any source |
| Sebario | 1,056 | 0 | Dead zone: no towers from any source |
| Suclaran | 1,992 | 0 | Dead zone: no towers from any source |
| Tamborong | 1,056 | 0 | Dead zone: no towers from any source |