San Isidro comprises 9 barangays with an estimated population of 70,090. 0 of its barangays (0%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alua | 5,581 | 9 | Crowdsourced signal only (no registered tower) |
| Calaba | 3,104 | 3 | Crowdsourced signal only (no registered tower) |
| Malapit | 13,615 | 14 | Crowdsourced signal only (no registered tower) |
| Mangga | 4,320 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion | 11,691 | 14 | Crowdsourced signal only (no registered tower) |
| Pulo | 5,831 | 2 | Crowdsourced signal only (no registered tower) |
| San Roque | 3,606 | 10 | Crowdsourced signal only (no registered tower) |
| Sto. Cristo | 6,609 | 5 | Crowdsourced signal only (no registered tower) |
| Tabon | 15,733 | 1 | Crowdsourced signal only (no registered tower) |