Santa Maria comprises 20 barangays with an estimated population of 22,975. 14 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 |
|---|---|---|---|
| Bangad | 779 | 0 | Dead zone: no towers from any source |
| Buenavista | 1,394 | 0 | Dead zone: no towers from any source |
| Calamagui East | 160 | 0 | Dead zone: no towers from any source |
| Calamagui North | 1,622 | 0 | Dead zone: no towers from any source |
| Calamagui West | 1,099 | 0 | Dead zone: no towers from any source |
| Divisoria | 406 | 0 | Dead zone: no towers from any source |
| Lingaling | 1,600 | 0 | Dead zone: no towers from any source |
| Mozzozzin North | 252 | 1 | Crowdsourced signal only (no registered tower) |
| Mozzozzin Sur | 177 | 2 | Crowdsourced signal only (no registered tower) |
| Naganacan | 3,767 | 13 | Crowdsourced signal only (no registered tower) |
| Poblacion 1 | 864 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion 2 | 119 | 0 | Dead zone: no towers from any source |
| Poblacion 3 | 91 | 0 | Dead zone: no towers from any source |
| Quinagabian | 2,240 | 0 | Dead zone: no towers from any source |
| San Antonio | 691 | 0 | Dead zone: no towers from any source |
| San Isidro East | 849 | 0 | Dead zone: no towers from any source |
| San Isidro West | 307 | 1 | Crowdsourced signal only (no registered tower) |
| San Rafael East | 1,547 | 0 | Dead zone: no towers from any source |
| San Rafael West | 2,975 | 0 | Dead zone: no towers from any source |
| Villabuena | 2,036 | 7 | Crowdsourced signal only (no registered tower) |