Santa Maria comprises 25 barangays with an estimated population of 26,045. 11 of its barangays (44%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Adia | 686 | 1 | Crowdsourced signal only (no registered tower) |
| Bagong Pook | 963 | 1 | Crowdsourced signal only (no registered tower) |
| Bagumbayan | 652 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay I (Pob.) | 373 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay II (Pob.) | 142 | 0 | Dead zone: no towers from any source |
| Barangay III (Pob.) | 604 | 0 | Dead zone: no towers from any source |
| Barangay IV (Pob.) | 689 | 0 | Dead zone: no towers from any source |
| Bubukal | 260 | 0 | Dead zone: no towers from any source |
| Cabooan | 2,776 | 2 | Crowdsourced signal only (no registered tower) |
| Calangay | 1,294 | 2 | Crowdsourced signal only (no registered tower) |
| Cambuja | 2,371 | 3 | Crowdsourced signal only (no registered tower) |
| Coralan | 2,144 | 0 | Dead zone: no towers from any source |
| Cueva | 686 | 11 | Crowdsourced signal only (no registered tower) |
| Inayapan | 90 | 0 | Dead zone: no towers from any source |
| Jose Laurel, Sr. | 895 | 18 | Crowdsourced signal only (no registered tower) |
| Jose Rizal | 98 | 0 | Dead zone: no towers from any source |
| Kayhakat | 2,309 | 1 | Crowdsourced signal only (no registered tower) |
| Macasipac | 419 | 0 | Dead zone: no towers from any source |
| Masinao | 378 | 0 | Dead zone: no towers from any source |
| Mataling-Ting | 859 | 1 | Crowdsourced signal only (no registered tower) |
| Pao-o | 458 | 1 | Crowdsourced signal only (no registered tower) |
| Parang Ng Buho | 579 | 1 | Crowdsourced signal only (no registered tower) |
| Santiago | 2,371 | 7 | Crowdsourced signal only (no registered tower) |
| Talangka | 2,305 | 0 | Dead zone: no towers from any source |
| Tungkod | 1,644 | 0 | Dead zone: no towers from any source |