Marcos comprises 13 barangays with an estimated population of 17,316. 13 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 |
|---|---|---|---|
| Cacafean | 522 | 0 | Dead zone: no towers from any source |
| Daquioag | 1,096 | 0 | Dead zone: no towers from any source |
| Elizabeth (Culao) | 308 | 0 | Dead zone: no towers from any source |
| Escoda | 1,686 | 0 | Dead zone: no towers from any source |
| Ferdinand | 375 | 0 | Dead zone: no towers from any source |
| Fortuna | 902 | 0 | Dead zone: no towers from any source |
| Imelda (Capariaan) | 504 | 0 | Dead zone: no towers from any source |
| Lydia (Pob.) | 3,468 | 0 | Dead zone: no towers from any source |
| Mabuti | 664 | 0 | Dead zone: no towers from any source |
| Pacifico (Agunit) | 1,599 | 0 | Dead zone: no towers from any source |
| Santiago | 2,667 | 0 | Dead zone: no towers from any source |
| Tabucbuc (Ragas) | 2,263 | 0 | Dead zone: no towers from any source |
| Valdez (Biding) | 1,262 | 0 | Dead zone: no towers from any source |