Rosario comprises 11 barangays with an estimated population of 13,884. 10 of its barangays (91%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Aguada | 742 | 0 | Dead zone: no towers from any source |
| Bantolinao | 1,320 | 0 | Dead zone: no towers from any source |
| Buenavista | 1,009 | 0 | Dead zone: no towers from any source |
| Commonwealth | 1,811 | 5 | Crowdsourced signal only (no registered tower) |
| Guindaulan | 717 | 0 | Dead zone: no towers from any source |
| Jamoog | 56 | 0 | Dead zone: no towers from any source |
| Kailingan | 334 | 0 | Dead zone: no towers from any source |
| Ligaya | 765 | 0 | Dead zone: no towers from any source |
| Poblacion | 500 | 0 | Dead zone: no towers from any source |
| Salhag | 2,674 | 0 | Dead zone: no towers from any source |
| San Lorenzo | 3,956 | 0 | Dead zone: no towers from any source |