Duero comprises 21 barangays with an estimated population of 17,023. 17 of its barangays (81%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alejawan | 717 | 0 | Dead zone: no towers from any source |
| Angilan | 467 | 0 | Dead zone: no towers from any source |
| Anibongan | 643 | 0 | Dead zone: no towers from any source |
| Bangwalog | 1,529 | 0 | Dead zone: no towers from any source |
| Cansuhay | 666 | 0 | Dead zone: no towers from any source |
| Danao | 991 | 0 | Dead zone: no towers from any source |
| Duay | 348 | 0 | Dead zone: no towers from any source |
| Guinsularan | 1,050 | 1 | Crowdsourced signal only (no registered tower) |
| Imelda | 428 | 0 | Dead zone: no towers from any source |
| Itum | 1,781 | 0 | Dead zone: no towers from any source |
| Langkis | 783 | 1 | Crowdsourced signal only (no registered tower) |
| Lobogon | 742 | 0 | Dead zone: no towers from any source |
| Madua Norte | 376 | 0 | Dead zone: no towers from any source |
| Madua Sur | 550 | 2 | Crowdsourced signal only (no registered tower) |
| Mambool | 561 | 0 | Dead zone: no towers from any source |
| Mawi | 756 | 0 | Dead zone: no towers from any source |
| Payao | 526 | 0 | Dead zone: no towers from any source |
| San Antonio (Pob.) | 976 | 0 | Dead zone: no towers from any source |
| San Isidro | 1,053 | 0 | Dead zone: no towers from any source |
| San Pedro | 1,589 | 1 | Crowdsourced signal only (no registered tower) |
| Taytay | 491 | 0 | Dead zone: no towers from any source |