Marilao comprises 16 barangays with an estimated population of 139,035. 1 of its barangays (6%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Abangan Norte | 7,938 | 20 | Crowdsourced signal only (no registered tower) |
| Abangan Sur | 6,160 | 14 | Crowdsourced signal only (no registered tower) |
| Ibayo | 7,618 | 26 | Crowdsourced signal only (no registered tower) |
| Lambakin | 19,268 | 67 | Crowdsourced signal only (no registered tower) |
| Lias | 14,603 | 79 | Crowdsourced signal only (no registered tower) |
| Loma de Gato | 19,747 | 129 | Crowdsourced signal only (no registered tower) |
| Nagbalon | 2,576 | 7 | Crowdsourced signal only (no registered tower) |
| Patubig | 13,262 | 90 | Crowdsourced signal only (no registered tower) |
| Poblacion I | 210 | 0 | Dead zone: no towers from any source |
| Poblacion II | 748 | 17 | Crowdsourced signal only (no registered tower) |
| Prenza I | 5,572 | 19 | Crowdsourced signal only (no registered tower) |
| Prenza II | 9,650 | 28 | Crowdsourced signal only (no registered tower) |
| Santa Rosa I | 5,321 | 28 | Crowdsourced signal only (no registered tower) |
| Santa Rosa II | 6,166 | 11 | Crowdsourced signal only (no registered tower) |
| Saog | 9,367 | 27 | Crowdsourced signal only (no registered tower) |
| Tabing Ilog | 10,829 | 15 | Crowdsourced signal only (no registered tower) |