Sarrat comprises 24 barangays with an estimated population of 24,466. 12 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 |
|---|---|---|---|
| San Agustin (Pob.) | 579 | 2 | Crowdsourced signal only (no registered tower) |
| San Andres | 2,268 | 0 | Dead zone: no towers from any source |
| San Antonio | 1,031 | 1 | Crowdsourced signal only (no registered tower) |
| San Bernabe | 445 | 0 | Dead zone: no towers from any source |
| San Cristobal | 1,688 | 1 | Crowdsourced signal only (no registered tower) |
| San Felipe | 973 | 1 | Crowdsourced signal only (no registered tower) |
| San Francisco (Pob.) | 888 | 0 | Dead zone: no towers from any source |
| San Isidro | 1,209 | 4 | Crowdsourced signal only (no registered tower) |
| San Joaquin (Pob.) | 1,765 | 2 | Crowdsourced signal only (no registered tower) |
| San Jose | 1,504 | 2 | Crowdsourced signal only (no registered tower) |
| San Juan | 279 | 0 | Dead zone: no towers from any source |
| San Leandro (Pob.) | 475 | 0 | Dead zone: no towers from any source |
| San Lorenzo | 1,196 | 0 | Dead zone: no towers from any source |
| San Manuel | 1,463 | 0 | Dead zone: no towers from any source |
| San Marcos | 454 | 3 | Crowdsourced signal only (no registered tower) |
| San Nicolas | 1,706 | 0 | Dead zone: no towers from any source |
| San Pedro | 674 | 0 | Dead zone: no towers from any source |
| San Roque | 1,274 | 0 | Dead zone: no towers from any source |
| San Vicente (Pob.) | 799 | 2 | Crowdsourced signal only (no registered tower) |
| Santa Barbara (Pob.) | 550 | 1 | Crowdsourced signal only (no registered tower) |
| Santa Magdalena | 554 | 5 | Crowdsourced signal only (no registered tower) |
| Santa Rosa | 1,468 | 0 | Dead zone: no towers from any source |
| Santo Santiago | 343 | 0 | Dead zone: no towers from any source |
| Santo Tomas | 881 | 2 | Crowdsourced signal only (no registered tower) |