San Esteban comprises 10 barangays with an estimated population of 8,090. 5 of its barangays (50%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Ansad | 880 | 0 | Dead zone: no towers from any source |
| Apatot | 1,430 | 1 | Crowdsourced signal only (no registered tower) |
| Bateria | 211 | 0 | Dead zone: no towers from any source |
| Cabaroan | 1,210 | 0 | Dead zone: no towers from any source |
| Cappa-cappa | 1,118 | 0 | Dead zone: no towers from any source |
| Poblacion | 274 | 0 | Dead zone: no towers from any source |
| San Nicolas | 1,524 | 5 | Crowdsourced signal only (no registered tower) |
| San Pablo | 550 | 6 | Crowdsourced signal only (no registered tower) |
| San Rafael | 505 | 1 | Crowdsourced signal only (no registered tower) |
| Villa Quirino | 388 | 1 | Crowdsourced signal only (no registered tower) |