San Jose de Buan comprises 14 barangays with an estimated population of 6,043. 14 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 |
|---|---|---|---|
| Aguingayan | 194 | 0 | Dead zone: no towers from any source |
| Babaclayon | 110 | 0 | Dead zone: no towers from any source |
| Barangay 1 (Pob.) | 373 | 0 | Dead zone: no towers from any source |
| Barangay 2 (Pob.) | 217 | 0 | Dead zone: no towers from any source |
| Barangay 3 (Pob.) | 1,441 | 0 | Dead zone: no towers from any source |
| Barangay 4 (Pob.) | 940 | 0 | Dead zone: no towers from any source |
| Can-aponte | 227 | 0 | Dead zone: no towers from any source |
| Cataydongan | 133 | 0 | Dead zone: no towers from any source |
| Gusa | 405 | 0 | Dead zone: no towers from any source |
| Hagbay | 208 | 0 | Dead zone: no towers from any source |
| Hibaca-an | 643 | 0 | Dead zone: no towers from any source |
| Hiduroma | 426 | 0 | Dead zone: no towers from any source |
| Hilumot | 373 | 0 | Dead zone: no towers from any source |
| San Nicolas | 353 | 0 | Dead zone: no towers from any source |