Mahaplag comprises 28 barangays with an estimated population of 24,172. 19 of its barangays (68%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Campin | 653 | 0 | Dead zone: no towers from any source |
| Cuatro de Agosto | 337 | 5 | Crowdsourced signal only (no registered tower) |
| Hiluctogan | 845 | 0 | Dead zone: no towers from any source |
| Hilusig | 1,198 | 6 | Crowdsourced signal only (no registered tower) |
| Himamara | 99 | 0 | Dead zone: no towers from any source |
| Hinaguimitan | 1,467 | 0 | Dead zone: no towers from any source |
| Liberacion | 251 | 2 | Crowdsourced signal only (no registered tower) |
| Mabuhay | 218 | 0 | Dead zone: no towers from any source |
| Mabunga | 190 | 0 | Dead zone: no towers from any source |
| Magsuganao | 797 | 1 | Crowdsourced signal only (no registered tower) |
| Mahayag | 480 | 1 | Crowdsourced signal only (no registered tower) |
| Mahayahay | 836 | 0 | Dead zone: no towers from any source |
| Maligaya | 133 | 0 | Dead zone: no towers from any source |
| Malinao | 1,583 | 0 | Dead zone: no towers from any source |
| Malipoon | 167 | 0 | Dead zone: no towers from any source |
| Palañogan | 471 | 0 | Dead zone: no towers from any source |
| Paril | 812 | 2 | Crowdsourced signal only (no registered tower) |
| Pinamonoan | 225 | 0 | Dead zone: no towers from any source |
| Poblacion | 1,914 | 2 | Crowdsourced signal only (no registered tower) |
| Polahongon | 2,590 | 0 | Dead zone: no towers from any source |
| San Isidro | 921 | 0 | Dead zone: no towers from any source |
| San Juan | 575 | 0 | Dead zone: no towers from any source |
| Santa Cruz | 1,868 | 0 | Dead zone: no towers from any source |
| Santo Niño | 188 | 0 | Dead zone: no towers from any source |
| Tagaytay | 845 | 1 | Crowdsourced signal only (no registered tower) |
| Uguis | 1,077 | 1 | Crowdsourced signal only (no registered tower) |
| Union | 1,050 | 0 | Dead zone: no towers from any source |
| Upper Mahaplag | 2,382 | 0 | Dead zone: no towers from any source |