Santa Maria comprises 22 barangays with an estimated population of 43,246. 20 of its barangays (91%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Basiawan | 6,161 | 6 | Crowdsourced signal only (no registered tower) |
| Buca | 2,462 | 0 | Dead zone: no towers from any source |
| Cadaatan | 1,117 | 0 | Dead zone: no towers from any source |
| Datu Daligasao | 2,179 | 0 | Dead zone: no towers from any source |
| Datu Intan | 767 | 0 | Dead zone: no towers from any source |
| Kidadan | 931 | 0 | Dead zone: no towers from any source |
| Kinilidan | 547 | 0 | Dead zone: no towers from any source |
| Kisulad | 1,019 | 0 | Dead zone: no towers from any source |
| Malalag Tubig | 609 | 0 | Dead zone: no towers from any source |
| Mamacao | 2,233 | 0 | Dead zone: no towers from any source |
| Ogpao | 670 | 0 | Dead zone: no towers from any source |
| Poblacion | 7,930 | 6 | Crowdsourced signal only (no registered tower) |
| Pongpong | 3,778 | 0 | Dead zone: no towers from any source |
| San Agustin | 3,941 | 0 | Dead zone: no towers from any source |
| San Antonio | 2,454 | 0 | Dead zone: no towers from any source |
| San Isidro | 1,659 | 0 | Dead zone: no towers from any source |
| San Juan | 294 | 0 | Dead zone: no towers from any source |
| San Pedro | 850 | 0 | Dead zone: no towers from any source |
| San Roque | 752 | 0 | Dead zone: no towers from any source |
| Santo Niño | 227 | 0 | Dead zone: no towers from any source |
| Santo Rosario | 1,216 | 0 | Dead zone: no towers from any source |
| Tanglad | 1,450 | 0 | Dead zone: no towers from any source |