San Narciso comprises 17 barangays with an estimated population of 35,082. 7 of its barangays (41%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alusiis | 2,219 | 3 | Crowdsourced signal only (no registered tower) |
| Beddeng | 1,592 | 2 | Crowdsourced signal only (no registered tower) |
| Candelaria (Pob.) | 185 | 0 | Dead zone: no towers from any source |
| Dallipawen | 1,072 | 0 | Dead zone: no towers from any source |
| Grullo | 2,215 | 1 | Crowdsourced signal only (no registered tower) |
| La Paz | 4,378 | 6 | Crowdsourced signal only (no registered tower) |
| Libertad (Pob.) | 375 | 2 | Crowdsourced signal only (no registered tower) |
| Namatacan | 4,334 | 0 | Dead zone: no towers from any source |
| Natividad (Pob.) | 4,402 | 4 | Crowdsourced signal only (no registered tower) |
| Omaya | 956 | 0 | Dead zone: no towers from any source |
| Paite | 479 | 0 | Dead zone: no towers from any source |
| Patrocinio (Pob.) | 4,599 | 6 | Crowdsourced signal only (no registered tower) |
| San Jose (Pob.) | 549 | 1 | Crowdsourced signal only (no registered tower) |
| San Juan (Pob.) | 1,423 | 7 | Crowdsourced signal only (no registered tower) |
| San Pascual (Pob.) | 2,142 | 0 | Dead zone: no towers from any source |
| San Rafael (Pob.) | 971 | 0 | Dead zone: no towers from any source |
| Simminublan | 3,191 | 9 | Crowdsourced signal only (no registered tower) |