Mandaon comprises 26 barangays with an estimated population of 47,584. 26 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 |
|---|---|---|---|
| Alas | 3,598 | 0 | Dead zone: no towers from any source |
| Ayat | 2,009 | 0 | Dead zone: no towers from any source |
| Bat-Ongan | 1,720 | 0 | Dead zone: no towers from any source |
| Bugtong | 2,036 | 0 | Dead zone: no towers from any source |
| Buri | 1,957 | 0 | Dead zone: no towers from any source |
| Cabitan | 6,955 | 0 | Dead zone: no towers from any source |
| Cagmasoso | 204 | 0 | Dead zone: no towers from any source |
| Canomoy | 1,685 | 0 | Dead zone: no towers from any source |
| Centro | 599 | 0 | Dead zone: no towers from any source |
| Dayao | 1,800 | 0 | Dead zone: no towers from any source |
| Guincaiptan | 560 | 0 | Dead zone: no towers from any source |
| Laguinbanwa | 2,032 | 0 | Dead zone: no towers from any source |
| Lantangan | 3,050 | 0 | Dead zone: no towers from any source |
| Looc | 804 | 0 | Dead zone: no towers from any source |
| Mabatobato | 875 | 0 | Dead zone: no towers from any source |
| Maolingon | 2,831 | 0 | Dead zone: no towers from any source |
| Nailaban | 1,249 | 0 | Dead zone: no towers from any source |
| Nanipsan | 588 | 0 | Dead zone: no towers from any source |
| Pinamangcaan | 426 | 0 | Dead zone: no towers from any source |
| Poblacion | 3,111 | 0 | Dead zone: no towers from any source |
| Polo Dacu | 770 | 0 | Dead zone: no towers from any source |
| San Juan | 2,559 | 0 | Dead zone: no towers from any source |
| San Pablo | 1,187 | 0 | Dead zone: no towers from any source |
| Santa Fe | 444 | 0 | Dead zone: no towers from any source |
| Tagpu | 2,427 | 0 | Dead zone: no towers from any source |
| Tumalaytay | 2,108 | 0 | Dead zone: no towers from any source |