Santa Cruz comprises 18 barangays with an estimated population of 88,128. 6 of its barangays (33%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Astorga | 11,958 | 21 | Crowdsourced signal only (no registered tower) |
| Bato | 5,955 | 6 | Crowdsourced signal only (no registered tower) |
| Coronon | 6,835 | 12 | Crowdsourced signal only (no registered tower) |
| Darong | 6,712 | 12 | Crowdsourced signal only (no registered tower) |
| Inawayan | 4,160 | 17 | Crowdsourced signal only (no registered tower) |
| Jose Rizal | 703 | 0 | Dead zone: no towers from any source |
| Matutungan | 882 | 0 | Dead zone: no towers from any source |
| Melilia | 850 | 0 | Dead zone: no towers from any source |
| Saliducon | 1,187 | 0 | Dead zone: no towers from any source |
| Sibulan | 5,873 | 1 | Crowdsourced signal only (no registered tower) |
| Sinoron | 3,602 | 0 | Dead zone: no towers from any source |
| Tagabuli | 3,884 | 8 | Crowdsourced signal only (no registered tower) |
| Tibolo | 1,729 | 0 | Dead zone: no towers from any source |
| Tuban | 5,218 | 8 | Crowdsourced signal only (no registered tower) |
| Zone I (Pob.) | 5,658 | 6 | Crowdsourced signal only (no registered tower) |
| Zone II (Pob.) | 6,378 | 3 | Crowdsourced signal only (no registered tower) |
| Zone III (Pob.) | 8,581 | 6 | Crowdsourced signal only (no registered tower) |
| Zone IV (Pob.) | 7,963 | 4 | Crowdsourced signal only (no registered tower) |