Tanza comprises 41 barangays with an estimated population of 273,910. 9 of its barangays (22%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Amaya I | 5,746 | 15 | Crowdsourced signal only (no registered tower) |
| Amaya II | 8,351 | 13 | Crowdsourced signal only (no registered tower) |
| Amaya III | 10,394 | 1 | Crowdsourced signal only (no registered tower) |
| Amaya IV | 719 | 0 | Dead zone: no towers from any source |
| Amaya V | 859 | 2 | Crowdsourced signal only (no registered tower) |
| Amaya VI | 640 | 0 | Dead zone: no towers from any source |
| Amaya VII | 2,179 | 0 | Dead zone: no towers from any source |
| Bagtas | 27,073 | 12 | Crowdsourced signal only (no registered tower) |
| Barangay I (Pob.) | 500 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay II (Pob.) | 452 | 0 | Dead zone: no towers from any source |
| Barangay III (Pob.) | 604 | 2 | Crowdsourced signal only (no registered tower) |
| Barangay IV (Pob.) | 1,064 | 5 | Crowdsourced signal only (no registered tower) |
| Biga | 6,726 | 9 | Crowdsourced signal only (no registered tower) |
| Biwas | 7,577 | 7 | Crowdsourced signal only (no registered tower) |
| Bucal | 3,839 | 7 | Crowdsourced signal only (no registered tower) |
| Bunga | 3,409 | 7 | Crowdsourced signal only (no registered tower) |
| Calibuyo | 7,675 | 20 | Crowdsourced signal only (no registered tower) |
| Capipisa | 7,535 | 7 | Crowdsourced signal only (no registered tower) |
| Daang Amaya I | 9,545 | 15 | Crowdsourced signal only (no registered tower) |
| Daang Amaya II | 10,100 | 11 | Crowdsourced signal only (no registered tower) |
| Daang Amaya III | 4,194 | 7 | Crowdsourced signal only (no registered tower) |
| Halayhay | 6,336 | 2 | Crowdsourced signal only (no registered tower) |
| Julugan I | 4,307 | 1 | Crowdsourced signal only (no registered tower) |
| Julugan II | 945 | 0 | Dead zone: no towers from any source |
| Julugan III | 7,926 | 0 | Dead zone: no towers from any source |
| Julugan IV | 941 | 0 | Dead zone: no towers from any source |
| Julugan V | 2,445 | 0 | Dead zone: no towers from any source |
| Julugan VI | 4,868 | 2 | Crowdsourced signal only (no registered tower) |
| Julugan VII | 991 | 0 | Dead zone: no towers from any source |
| Julugan VIII | 6,683 | 2 | Crowdsourced signal only (no registered tower) |
| Lambingan | 3,112 | 8 | Crowdsourced signal only (no registered tower) |
| Mulawin | 9,914 | 11 | Crowdsourced signal only (no registered tower) |
| Paradahan I | 18,356 | 18 | Crowdsourced signal only (no registered tower) |
| Paradahan II | 12,348 | 16 | Crowdsourced signal only (no registered tower) |
| Punta I | 10,550 | 11 | Crowdsourced signal only (no registered tower) |
| Punta II | 4,499 | 12 | Crowdsourced signal only (no registered tower) |
| Sahud Ulan | 31,401 | 43 | Crowdsourced signal only (no registered tower) |
| Sanja Mayor | 5,317 | 10 | Crowdsourced signal only (no registered tower) |
| Santol | 16,360 | 9 | Crowdsourced signal only (no registered tower) |
| Tanauan | 4,978 | 16 | Crowdsourced signal only (no registered tower) |
| Tres Cruses | 2,452 | 1 | Crowdsourced signal only (no registered tower) |