Calayan comprises 12 barangays with an estimated population of 12,349. 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 |
|---|---|---|---|
| Babuyan Claro | 869 | 0 | Dead zone: no towers from any source |
| Balatubat | 1,328 | 0 | Dead zone: no towers from any source |
| Cabudadan | 727 | 0 | Dead zone: no towers from any source |
| Centro II | 589 | 0 | Dead zone: no towers from any source |
| Dadao | 964 | 0 | Dead zone: no towers from any source |
| Dalupiri | 368 | 0 | Dead zone: no towers from any source |
| Dibay | 1,615 | 0 | Dead zone: no towers from any source |
| Dilam | 1,107 | 0 | Dead zone: no towers from any source |
| Magsidel | 1,673 | 0 | Dead zone: no towers from any source |
| Minabel | 1,380 | 0 | Dead zone: no towers from any source |
| Naguilian | 1,281 | 0 | Dead zone: no towers from any source |
| Poblacion | 448 | 0 | Dead zone: no towers from any source |