Santa Maria comprises 23 barangays with an estimated population of 28,353. 16 of its barangays (70%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bal-loy | 707 | 0 | Dead zone: no towers from any source |
| Bantog | 871 | 0 | Dead zone: no towers from any source |
| Caboluan | 1,663 | 0 | Dead zone: no towers from any source |
| Cal-litang | 1,699 | 1 | Crowdsourced signal only (no registered tower) |
| Capandanan | 595 | 0 | Dead zone: no towers from any source |
| Cauplasan | 749 | 0 | Dead zone: no towers from any source |
| Dalayap | 1,328 | 0 | Dead zone: no towers from any source |
| Libsong | 674 | 0 | Dead zone: no towers from any source |
| Namagbagan | 2,361 | 0 | Dead zone: no towers from any source |
| Paitan | 1,403 | 0 | Dead zone: no towers from any source |
| Pataquid | 2,022 | 0 | Dead zone: no towers from any source |
| Pilar | 719 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion East | 590 | 0 | Dead zone: no towers from any source |
| Poblacion West | 2,065 | 1 | Crowdsourced signal only (no registered tower) |
| Pugot | 1,189 | 0 | Dead zone: no towers from any source |
| Samon | 1,973 | 0 | Dead zone: no towers from any source |
| San Alejandro | 351 | 2 | Crowdsourced signal only (no registered tower) |
| San Mariano | 512 | 0 | Dead zone: no towers from any source |
| San Pablo | 551 | 0 | Dead zone: no towers from any source |
| San Patricio | 2,555 | 4 | Crowdsourced signal only (no registered tower) |
| San Vicente | 1,064 | 1 | Crowdsourced signal only (no registered tower) |
| Santa Cruz | 578 | 0 | Dead zone: no towers from any source |
| Sta. Rosa | 2,134 | 1 | Crowdsourced signal only (no registered tower) |