Isabela comprises 30 barangays with an estimated population of 59,599. 19 of its barangays (63%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Amin | 780 | 0 | Dead zone: no towers from any source |
| Banogbanog | 1,287 | 0 | Dead zone: no towers from any source |
| Barangay 1 (Pob.) | 1,743 | 0 | Dead zone: no towers from any source |
| Barangay 2 (Pob.) | 837 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay 3 (Pob.) | 1,943 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay 4 (Pob.) | 817 | 2 | Crowdsourced signal only (no registered tower) |
| Barangay 5 (Pob.) | 2,761 | 6 | Crowdsourced signal only (no registered tower) |
| Barangay 6 (Pob.) | 424 | 0 | Dead zone: no towers from any source |
| Barangay 7 (Pob.) | 1,254 | 7 | Crowdsourced signal only (no registered tower) |
| Barangay 8 (Pob.) | 762 | 5 | Crowdsourced signal only (no registered tower) |
| Barangay 9 (Pob.) | 1,386 | 1 | Crowdsourced signal only (no registered tower) |
| Bulad | 3,448 | 0 | Dead zone: no towers from any source |
| Bungahin | 1,493 | 0 | Dead zone: no towers from any source |
| Cabcab | 837 | 0 | Dead zone: no towers from any source |
| Camangcamang | 5,039 | 0 | Dead zone: no towers from any source |
| Camp Clark | 904 | 0 | Dead zone: no towers from any source |
| Cansalongon | 3,109 | 0 | Dead zone: no towers from any source |
| Guintubhan | 3,331 | 8 | Crowdsourced signal only (no registered tower) |
| Libas | 1,276 | 0 | Dead zone: no towers from any source |
| Limalima | 1,235 | 0 | Dead zone: no towers from any source |
| Makilignit | 796 | 0 | Dead zone: no towers from any source |
| Mansablay | 3,163 | 0 | Dead zone: no towers from any source |
| Maytubig | 2,296 | 5 | Crowdsourced signal only (no registered tower) |
| Panaquiao | 1,966 | 1 | Crowdsourced signal only (no registered tower) |
| Riverside | 1,562 | 0 | Dead zone: no towers from any source |
| Rumirang | 1,094 | 0 | Dead zone: no towers from any source |
| San Agustin | 3,948 | 0 | Dead zone: no towers from any source |
| Sebucawan | 1,876 | 0 | Dead zone: no towers from any source |
| Sikatuna | 1,879 | 0 | Dead zone: no towers from any source |
| Tinongan | 6,353 | 5 | Crowdsourced signal only (no registered tower) |