Cagayancillo comprises 12 barangays with an estimated population of 3,462. 12 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 |
|---|---|---|---|
| Bantayan (Pob.) | 71 | 0 | Dead zone: no towers from any source |
| Calsada (Pob.) | 61 | 0 | Dead zone: no towers from any source |
| Convento (Pob.) | 102 | 0 | Dead zone: no towers from any source |
| Lipot North (Pob.) | 17 | 0 | Dead zone: no towers from any source |
| Lipot South (Pob.) | 9 | 0 | Dead zone: no towers from any source |
| Magsaysay | 1,162 | 0 | Dead zone: no towers from any source |
| Mampio | 223 | 0 | Dead zone: no towers from any source |
| Nusa | 281 | 0 | Dead zone: no towers from any source |
| Santa Cruz | 694 | 0 | Dead zone: no towers from any source |
| Tacas (Pob.) | 161 | 0 | Dead zone: no towers from any source |
| Talaga | 681 | 0 | Dead zone: no towers from any source |
| Wahig (Pob.) | 0 | 0 | Dead zone: no towers from any source |