San Carlos City comprises 86 barangays with an estimated population of 209,149. 53 of its barangays (62%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Abanon | 2,405 | 0 | Dead zone: no towers from any source |
| Agdao | 3,551 | 3 | Crowdsourced signal only (no registered tower) |
| Anando | 1,390 | 0 | Dead zone: no towers from any source |
| Ano | 3,839 | 2 | Crowdsourced signal only (no registered tower) |
| Antipangol | 1,470 | 1 | Crowdsourced signal only (no registered tower) |
| Aponit | 2,640 | 9 | Crowdsourced signal only (no registered tower) |
| Bacnar | 5,056 | 0 | Dead zone: no towers from any source |
| Balaya | 1,408 | 0 | Dead zone: no towers from any source |
| Balayong | 1,155 | 0 | Dead zone: no towers from any source |
| Baldog | 2,430 | 1 | Crowdsourced signal only (no registered tower) |
| Balite Sur | 4,642 | 0 | Dead zone: no towers from any source |
| Balococ | 1,680 | 0 | Dead zone: no towers from any source |
| Bani | 1,246 | 0 | Dead zone: no towers from any source |
| Bega | 3,484 | 0 | Dead zone: no towers from any source |
| Bocboc | 1,833 | 3 | Crowdsourced signal only (no registered tower) |
| Bogaoan | 1,892 | 1 | Crowdsourced signal only (no registered tower) |
| Bolingit | 2,580 | 3 | Crowdsourced signal only (no registered tower) |
| Bolosan | 2,837 | 3 | Crowdsourced signal only (no registered tower) |
| Bonifacio (Pob.) | 117 | 1 | Crowdsourced signal only (no registered tower) |
| Buenglat | 1,161 | 0 | Dead zone: no towers from any source |
| Bugallon-Posadas Street (Pob.) | 403 | 0 | Dead zone: no towers from any source |
| Burgos Padlan (Pob.) | 305 | 2 | Crowdsourced signal only (no registered tower) |
| Cacaritan | 1,064 | 2 | Crowdsourced signal only (no registered tower) |
| Caingal | 891 | 0 | Dead zone: no towers from any source |
| Calobaoan | 9,732 | 0 | Dead zone: no towers from any source |
| Calomboyan | 2,748 | 0 | Dead zone: no towers from any source |
| Caoayan-Kiling | 6,103 | 1 | Crowdsourced signal only (no registered tower) |
| Capataan | 2,357 | 1 | Crowdsourced signal only (no registered tower) |
| Cobol | 2,798 | 2 | Crowdsourced signal only (no registered tower) |
| Coliling | 4,830 | 3 | Crowdsourced signal only (no registered tower) |
| Cruz | 5,061 | 0 | Dead zone: no towers from any source |
| Doyong | 2,357 | 0 | Dead zone: no towers from any source |
| Gamata | 1,484 | 0 | Dead zone: no towers from any source |
| Guelew | 4,106 | 0 | Dead zone: no towers from any source |
| Ilang | 1,318 | 0 | Dead zone: no towers from any source |
| Inerangan | 1,602 | 1 | Crowdsourced signal only (no registered tower) |
| Isla | 1,953 | 0 | Dead zone: no towers from any source |
| Libas | 3,186 | 0 | Dead zone: no towers from any source |
| Lilimasan | 3,740 | 0 | Dead zone: no towers from any source |
| Longos | 3,314 | 0 | Dead zone: no towers from any source |
| Lucban (Pob.) | 532 | 0 | Dead zone: no towers from any source |
| M. Soriano | 1,873 | 0 | Dead zone: no towers from any source |
| Mabalbalino | 716 | 0 | Dead zone: no towers from any source |
| Mabini (Pob.) | 117 | 2 | Crowdsourced signal only (no registered tower) |
| Magtaking | 5,186 | 1 | Crowdsourced signal only (no registered tower) |
| Malacañang | 7,507 | 0 | Dead zone: no towers from any source |
| Maliwara | 1,384 | 0 | Dead zone: no towers from any source |
| Mamarlao | 1,301 | 6 | Crowdsourced signal only (no registered tower) |
| Manzon | 1,482 | 19 | Crowdsourced signal only (no registered tower) |
| Matagdem | 2,058 | 0 | Dead zone: no towers from any source |
| Mestizo Norte | 2,238 | 0 | Dead zone: no towers from any source |
| Naguilayan | 3,809 | 0 | Dead zone: no towers from any source |
| Nilentap | 2,048 | 0 | Dead zone: no towers from any source |
| PNR Station Site | 1,301 | 0 | Dead zone: no towers from any source |
| Padilla-Gomez | 4,583 | 0 | Dead zone: no towers from any source |
| Pagal | 2,722 | 0 | Dead zone: no towers from any source |
| Paitan-Panoypoy | 5,227 | 1 | Crowdsourced signal only (no registered tower) |
| Palaming | 1,917 | 0 | Dead zone: no towers from any source |
| Palaris (Pob.) | 850 | 3 | Crowdsourced signal only (no registered tower) |
| Palospos | 925 | 0 | Dead zone: no towers from any source |
| Pangalangan | 2,355 | 0 | Dead zone: no towers from any source |
| Pangoloan | 2,388 | 0 | Dead zone: no towers from any source |
| Pangpang | 1,768 | 0 | Dead zone: no towers from any source |
| Parayao | 771 | 0 | Dead zone: no towers from any source |
| Payapa | 1,238 | 1 | Crowdsourced signal only (no registered tower) |
| Payar | 1,119 | 0 | Dead zone: no towers from any source |
| Perez Boulevard (Pob.) | 1,605 | 4 | Crowdsourced signal only (no registered tower) |
| Polo | 1,749 | 0 | Dead zone: no towers from any source |
| Quezon Boulevard (Pob.) | 4,555 | 0 | Dead zone: no towers from any source |
| Quintong | 924 | 0 | Dead zone: no towers from any source |
| Rizal (Pob.) | 2,549 | 6 | Crowdsourced signal only (no registered tower) |
| Roxas Boulevard (Pob.) | 1,912 | 14 | Crowdsourced signal only (no registered tower) |
| Salinap | 1,215 | 3 | Crowdsourced signal only (no registered tower) |
| San Juan | 3,084 | 2 | Crowdsourced signal only (no registered tower) |
| San Pedro-Taloy | 2,023 | 4 | Crowdsourced signal only (no registered tower) |
| Sapinit | 636 | 0 | Dead zone: no towers from any source |
| Supo | 985 | 0 | Dead zone: no towers from any source |
| Talang | 1,672 | 4 | Crowdsourced signal only (no registered tower) |
| Tamayo | 2,365 | 0 | Dead zone: no towers from any source |
| Tandang Sora | 366 | 0 | Dead zone: no towers from any source |
| Tandoc | 3,608 | 1 | Crowdsourced signal only (no registered tower) |
| Tarece | 3,791 | 0 | Dead zone: no towers from any source |
| Tarectec | 2,151 | 8 | Crowdsourced signal only (no registered tower) |
| Tayambani | 623 | 0 | Dead zone: no towers from any source |
| Tebag | 2,397 | 0 | Dead zone: no towers from any source |
| Turac | 7,356 | 0 | Dead zone: no towers from any source |