Mayantoc comprises 24 barangays with an estimated population of 40,188. 22 of its barangays (92%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Ambalingit | 1,018 | 0 | Dead zone: no towers from any source |
| Baybayaoas | 477 | 0 | Dead zone: no towers from any source |
| Bigbiga | 1,598 | 0 | Dead zone: no towers from any source |
| Binbinaca | 659 | 0 | Dead zone: no towers from any source |
| Calabtangan | 2,114 | 0 | Dead zone: no towers from any source |
| Caocaoayan | 414 | 0 | Dead zone: no towers from any source |
| Carabaoan | 1,844 | 0 | Dead zone: no towers from any source |
| Cubcub | 2,881 | 0 | Dead zone: no towers from any source |
| Gayonggayong | 420 | 0 | Dead zone: no towers from any source |
| Gossood | 900 | 0 | Dead zone: no towers from any source |
| Labney | 1,662 | 0 | Dead zone: no towers from any source |
| Mamonit | 3,785 | 0 | Dead zone: no towers from any source |
| Maniniog | 1,177 | 0 | Dead zone: no towers from any source |
| Mapandan | 1,431 | 0 | Dead zone: no towers from any source |
| Nambalan | 1,562 | 2 | Crowdsourced signal only (no registered tower) |
| Pedro L. Quines | 972 | 0 | Dead zone: no towers from any source |
| Pitombayog | 1,863 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion Norte | 3,268 | 0 | Dead zone: no towers from any source |
| Poblacion Sur | 3,743 | 0 | Dead zone: no towers from any source |
| Rotrottooc | 2,010 | 0 | Dead zone: no towers from any source |
| San Bartolome | 2,023 | 0 | Dead zone: no towers from any source |
| San Jose | 1,860 | 0 | Dead zone: no towers from any source |
| Taldiapan | 1,145 | 0 | Dead zone: no towers from any source |
| Tangcarang | 1,362 | 0 | Dead zone: no towers from any source |