Zumarraga comprises 25 barangays with an estimated population of 10,803. 25 of its barangays (100%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alegria | 219 | 0 | Dead zone: no towers from any source |
| Arteche | 502 | 0 | Dead zone: no towers from any source |
| Bioso | 1,206 | 0 | Dead zone: no towers from any source |
| Boblaran | 586 | 0 | Dead zone: no towers from any source |
| Botaera | 1,040 | 0 | Dead zone: no towers from any source |
| Buntay | 30 | 0 | Dead zone: no towers from any source |
| Camayse | 235 | 0 | Dead zone: no towers from any source |
| Canwarak | 336 | 0 | Dead zone: no towers from any source |
| Ibarra | 362 | 0 | Dead zone: no towers from any source |
| Lumalantang | 457 | 0 | Dead zone: no towers from any source |
| Macalunod | 445 | 0 | Dead zone: no towers from any source |
| Maga-an | 225 | 0 | Dead zone: no towers from any source |
| Maputi | 367 | 0 | Dead zone: no towers from any source |
| Marapilit | 121 | 0 | Dead zone: no towers from any source |
| Monbon | 777 | 0 | Dead zone: no towers from any source |
| Mualbual | 853 | 0 | Dead zone: no towers from any source |
| Pangdan | 190 | 0 | Dead zone: no towers from any source |
| Poblacion 1 (Barangay 1) | 33 | 0 | Dead zone: no towers from any source |
| Poblacion 2 (Barangay 2) | 49 | 0 | Dead zone: no towers from any source |
| Poro | 176 | 0 | Dead zone: no towers from any source |
| San Isidro | 745 | 0 | Dead zone: no towers from any source |
| Sugod | 313 | 0 | Dead zone: no towers from any source |
| Talib | 285 | 0 | Dead zone: no towers from any source |
| Tinaugan | 753 | 0 | Dead zone: no towers from any source |
| Tubigan | 498 | 0 | Dead zone: no towers from any source |