San Nicolas comprises 18 barangays with an estimated population of 25,891. 13 of its barangays (72%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Abelo | 1,119 | 0 | Dead zone: no towers from any source |
| Alas-as | 892 | 0 | Dead zone: no towers from any source |
| Balete | 2,072 | 0 | Dead zone: no towers from any source |
| Baluk-baluk | 1,267 | 3 | Crowdsourced signal only (no registered tower) |
| Bancoro | 3,180 | 0 | Dead zone: no towers from any source |
| Bangin | 2,516 | 1 | Crowdsourced signal only (no registered tower) |
| Calangay | 3,367 | 1 | Crowdsourced signal only (no registered tower) |
| Hipit | 601 | 0 | Dead zone: no towers from any source |
| Maabud North | 1,610 | 0 | Dead zone: no towers from any source |
| Maabud South | 426 | 0 | Dead zone: no towers from any source |
| Munlawin | 754 | 0 | Dead zone: no towers from any source |
| Pansipit | 700 | 0 | Dead zone: no towers from any source |
| Poblacion | 2,630 | 0 | Dead zone: no towers from any source |
| Pulang-Bato | 314 | 1 | Crowdsourced signal only (no registered tower) |
| Santo Niño | 1,327 | 1 | Crowdsourced signal only (no registered tower) |
| Sinturisan | 1,452 | 0 | Dead zone: no towers from any source |
| Tagudtod | 918 | 0 | Dead zone: no towers from any source |
| Talang | 746 | 0 | Dead zone: no towers from any source |