Tibiao comprises 21 barangays with an estimated population of 26,994. 18 of its barangays (86%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alegre | 310 | 0 | Dead zone: no towers from any source |
| Amar | 1,438 | 1 | Crowdsourced signal only (no registered tower) |
| Bandoja (Lupa-an) | 674 | 0 | Dead zone: no towers from any source |
| Castillo | 29 | 0 | Dead zone: no towers from any source |
| Esparagoza | 368 | 0 | Dead zone: no towers from any source |
| Importante | 898 | 0 | Dead zone: no towers from any source |
| La Paz | 1,187 | 0 | Dead zone: no towers from any source |
| Malabor | 1,852 | 0 | Dead zone: no towers from any source |
| Martinez | 1,822 | 0 | Dead zone: no towers from any source |
| Natividad | 712 | 0 | Dead zone: no towers from any source |
| Pitac | 1,799 | 0 | Dead zone: no towers from any source |
| Poblacion | 5,140 | 0 | Dead zone: no towers from any source |
| Salazar | 654 | 0 | Dead zone: no towers from any source |
| San Francisco Norte | 1,772 | 0 | Dead zone: no towers from any source |
| San Francisco Sur | 2,020 | 2 | Crowdsourced signal only (no registered tower) |
| San Isidro | 776 | 0 | Dead zone: no towers from any source |
| Santa Ana | 859 | 0 | Dead zone: no towers from any source |
| Santa Justa | 1,049 | 0 | Dead zone: no towers from any source |
| Santo Rosario | 1,047 | 0 | Dead zone: no towers from any source |
| Tigbaboy | 360 | 0 | Dead zone: no towers from any source |
| Tuno | 2,228 | 12 | Crowdsourced signal only (no registered tower) |