Santa Catalina comprises 22 barangays with an estimated population of 73,019. 11 of its barangays (50%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alangilan | 1,485 | 0 | Dead zone: no towers from any source |
| Amio | 3,277 | 0 | Dead zone: no towers from any source |
| Buenavista | 666 | 0 | Dead zone: no towers from any source |
| Caigangan | 1,406 | 0 | Dead zone: no towers from any source |
| Caranoche | 4,371 | 5 | Crowdsourced signal only (no registered tower) |
| Cawitan | 4,459 | 4 | Crowdsourced signal only (no registered tower) |
| Fatima | 363 | 0 | Dead zone: no towers from any source |
| Kabulacan | 2,960 | 7 | Crowdsourced signal only (no registered tower) |
| Mabuhay | 806 | 1 | Crowdsourced signal only (no registered tower) |
| Manalongon | 3,512 | 1 | Crowdsourced signal only (no registered tower) |
| Mansagomayon | 1,033 | 2 | Crowdsourced signal only (no registered tower) |
| Milagrosa | 4,078 | 0 | Dead zone: no towers from any source |
| Nagbalaye | 2,958 | 4 | Crowdsourced signal only (no registered tower) |
| Nagbinlod | 4,521 | 0 | Dead zone: no towers from any source |
| Obat | 4,544 | 2 | Crowdsourced signal only (no registered tower) |
| Poblacion | 16,442 | 9 | Crowdsourced signal only (no registered tower) |
| San Francisco | 2,092 | 0 | Dead zone: no towers from any source |
| San Jose | 3,468 | 0 | Dead zone: no towers from any source |
| San Miguel | 1,820 | 0 | Dead zone: no towers from any source |
| San Pedro | 2,192 | 1 | Crowdsourced signal only (no registered tower) |
| Santo Rosario | 1,122 | 1 | Crowdsourced signal only (no registered tower) |
| Talalak | 5,444 | 0 | Dead zone: no towers from any source |