City of Isabela comprises 45 barangays with an estimated population of 110,736. 25 of its barangays (56%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Aguada | 905 | 17 | Crowdsourced signal only (no registered tower) |
| Balatanay | 252 | 0 | Dead zone: no towers from any source |
| Baluno | 5,709 | 2 | Crowdsourced signal only (no registered tower) |
| Begang | 1,493 | 1 | Crowdsourced signal only (no registered tower) |
| Binuangan | 5,240 | 0 | Dead zone: no towers from any source |
| Busay | 3,133 | 0 | Dead zone: no towers from any source |
| Cabunbata | 10,289 | 0 | Dead zone: no towers from any source |
| Calvario | 4,015 | 0 | Dead zone: no towers from any source |
| Carbon | 221 | 0 | Dead zone: no towers from any source |
| Diki | 922 | 0 | Dead zone: no towers from any source |
| Dona Ramona T. Alano (Isabela Westsite) | 328 | 8 | Crowdsourced signal only (no registered tower) |
| Isabela Eastside (Pob.) | 1,005 | 1 | Crowdsourced signal only (no registered tower) |
| Isabela Proper (Pob.) | 71 | 1 | Crowdsourced signal only (no registered tower) |
| Kapatagan Grande | 1,102 | 3 | Crowdsourced signal only (no registered tower) |
| Kapayawan | 685 | 0 | Dead zone: no towers from any source |
| Kaumpurnah Zone I | 18 | 2 | Crowdsourced signal only (no registered tower) |
| Kaumpurnah Zone II | 34 | 0 | Dead zone: no towers from any source |
| Kaumpurnah Zone III | 25 | 0 | Dead zone: no towers from any source |
| Kumalarang | 1,427 | 0 | Dead zone: no towers from any source |
| La Piedad (Pob.) | 617 | 1 | Crowdsourced signal only (no registered tower) |
| Lampinigan | 32 | 0 | Dead zone: no towers from any source |
| Lanote | 13,226 | 5 | Crowdsourced signal only (no registered tower) |
| Lukbuton | 3,963 | 0 | Dead zone: no towers from any source |
| Lumbang | 2,265 | 1 | Crowdsourced signal only (no registered tower) |
| Makiri | 529 | 0 | Dead zone: no towers from any source |
| Maligue (Lunot) | 2,476 | 0 | Dead zone: no towers from any source |
| Marang-marang | 2,789 | 0 | Dead zone: no towers from any source |
| Marketsite (Pob.) | 77 | 2 | Crowdsourced signal only (no registered tower) |
| Masula | 3,401 | 0 | Dead zone: no towers from any source |
| Menzi | 3,811 | 7 | Crowdsourced signal only (no registered tower) |
| Panigayan | 864 | 0 | Dead zone: no towers from any source |
| Panunsulan | 1,861 | 0 | Dead zone: no towers from any source |
| Port Area (Pob.) | 74 | 1 | Crowdsourced signal only (no registered tower) |
| Riverside | 348 | 1 | Crowdsourced signal only (no registered tower) |
| San Rafael | 1,090 | 1 | Crowdsourced signal only (no registered tower) |
| Santa Barbara | 6,822 | 0 | Dead zone: no towers from any source |
| Santa Cruz (Pob.) | 172 | 0 | Dead zone: no towers from any source |
| Seaside (Pob.) | 87 | 5 | Crowdsourced signal only (no registered tower) |
| Small Kapatagan | 743 | 0 | Dead zone: no towers from any source |
| Sumagdang | 9,335 | 0 | Dead zone: no towers from any source |
| Sunrise Village (Pob.) | 1,659 | 3 | Crowdsourced signal only (no registered tower) |
| Tabiawan | 15,144 | 1 | Crowdsourced signal only (no registered tower) |
| Tabuk (Pob.) | 2,054 | 1 | Crowdsourced signal only (no registered tower) |
| Tampalan | 356 | 0 | Dead zone: no towers from any source |
| Timpul | 67 | 0 | Dead zone: no towers from any source |