Maragusan (San Mariano) comprises 24 barangays with an estimated population of 76,308. 21 of its barangays (88%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bagong Silang | 798 | 0 | Dead zone: no towers from any source |
| Bahi | 1,225 | 0 | Dead zone: no towers from any source |
| Cambagang | 1,829 | 2 | Crowdsourced signal only (no registered tower) |
| Coronobe | 2,365 | 0 | Dead zone: no towers from any source |
| Katipunan | 1,265 | 0 | Dead zone: no towers from any source |
| Lahi | 2,886 | 0 | Dead zone: no towers from any source |
| Langgawisan | 2,202 | 0 | Dead zone: no towers from any source |
| Mabugnao | 459 | 0 | Dead zone: no towers from any source |
| Magcagong | 5,627 | 0 | Dead zone: no towers from any source |
| Mahayahay | 583 | 0 | Dead zone: no towers from any source |
| Mapawa | 4,188 | 0 | Dead zone: no towers from any source |
| Maragusan (Pob.) | 24,502 | 28 | Crowdsourced signal only (no registered tower) |
| Mauswagon | 722 | 0 | Dead zone: no towers from any source |
| New Albay | 9,807 | 0 | Dead zone: no towers from any source |
| New Katipunan | 308 | 0 | Dead zone: no towers from any source |
| New Manay | 624 | 0 | Dead zone: no towers from any source |
| New Panay | 527 | 0 | Dead zone: no towers from any source |
| Paloc | 2,586 | 0 | Dead zone: no towers from any source |
| Pamintaran | 3,335 | 2 | Crowdsourced signal only (no registered tower) |
| Parasanon | 1,893 | 0 | Dead zone: no towers from any source |
| Talian | 2,575 | 0 | Dead zone: no towers from any source |
| Tandik | 2,315 | 0 | Dead zone: no towers from any source |
| Tigbao | 656 | 0 | Dead zone: no towers from any source |
| Tupas | 3,031 | 0 | Dead zone: no towers from any source |