City of Tandag (Capital) comprises 21 barangays with an estimated population of 49,468. 12 of its barangays (57%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Awasian | 1,931 | 1 | Crowdsourced signal only (no registered tower) |
| Bagong Lungsod (Pob.) | 4,824 | 7 | Crowdsourced signal only (no registered tower) |
| Bioto | 1,243 | 0 | Dead zone: no towers from any source |
| Bongtod Pob. (East West) | 3,918 | 0 | Dead zone: no towers from any source |
| Buenavista | 2,248 | 0 | Dead zone: no towers from any source |
| Dagocdoc (Pob.) | 3,625 | 9 | Crowdsourced signal only (no registered tower) |
| Mabua | 5,503 | 3 | Crowdsourced signal only (no registered tower) |
| Mabuhay | 1,517 | 0 | Dead zone: no towers from any source |
| Maitum | 989 | 0 | Dead zone: no towers from any source |
| Maticdum | 891 | 0 | Dead zone: no towers from any source |
| Pandanon | 1,464 | 0 | Dead zone: no towers from any source |
| Pangi | 210 | 0 | Dead zone: no towers from any source |
| Quezon | 1,316 | 1 | Crowdsourced signal only (no registered tower) |
| Rosario | 5,580 | 0 | Dead zone: no towers from any source |
| Salvacion | 782 | 0 | Dead zone: no towers from any source |
| San Agustin Norte | 798 | 3 | Crowdsourced signal only (no registered tower) |
| San Agustin Sur | 4,497 | 1 | Crowdsourced signal only (no registered tower) |
| San Antonio | 520 | 1 | Crowdsourced signal only (no registered tower) |
| San Isidro | 1,087 | 0 | Dead zone: no towers from any source |
| San Jose | 1,225 | 0 | Dead zone: no towers from any source |
| Telaje | 5,300 | 21 | Crowdsourced signal only (no registered tower) |