Tiwi comprises 25 barangays with an estimated population of 50,597. 13 of its barangays (52%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bagumbayan | 1,661 | 0 | Dead zone: no towers from any source |
| Bariis | 947 | 1 | Crowdsourced signal only (no registered tower) |
| Baybay | 3,097 | 0 | Dead zone: no towers from any source |
| Belen (Malabog) | 1,099 | 0 | Dead zone: no towers from any source |
| Biyong | 1,539 | 0 | Dead zone: no towers from any source |
| Bolo | 1,677 | 0 | Dead zone: no towers from any source |
| Cale | 4,574 | 0 | Dead zone: no towers from any source |
| Cararayan | 1,236 | 3 | Crowdsourced signal only (no registered tower) |
| Coro-coro | 1,019 | 0 | Dead zone: no towers from any source |
| Dap-dap | 879 | 2 | Crowdsourced signal only (no registered tower) |
| Gajo | 1,111 | 0 | Dead zone: no towers from any source |
| Joroan | 2,423 | 2 | Crowdsourced signal only (no registered tower) |
| Libjo | 2,501 | 2 | Crowdsourced signal only (no registered tower) |
| Libtong | 1,796 | 1 | Crowdsourced signal only (no registered tower) |
| Matalibong | 1,426 | 0 | Dead zone: no towers from any source |
| Maynonong | 883 | 1 | Crowdsourced signal only (no registered tower) |
| Mayong | 1,232 | 0 | Dead zone: no towers from any source |
| Misibis | 1,860 | 1 | Crowdsourced signal only (no registered tower) |
| Naga | 6,858 | 0 | Dead zone: no towers from any source |
| Nagas | 3,425 | 3 | Crowdsourced signal only (no registered tower) |
| Oyama | 610 | 1 | Crowdsourced signal only (no registered tower) |
| Putsan | 1,297 | 0 | Dead zone: no towers from any source |
| San Bernardo | 2,079 | 1 | Crowdsourced signal only (no registered tower) |
| Sogod | 1,218 | 0 | Dead zone: no towers from any source |
| Tigbi (Pob.) | 4,150 | 2 | Crowdsourced signal only (no registered tower) |