Agoncillo comprises 21 barangays with an estimated population of 47,049. 6 of its barangays (29%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Adia | 447 | 0 | Dead zone: no towers from any source |
| Bagong Sikat | 657 | 0 | Dead zone: no towers from any source |
| Balangon | 929 | 0 | Dead zone: no towers from any source |
| Bangin | 2,096 | 7 | Crowdsourced signal only (no registered tower) |
| Banyaga | 3,678 | 2 | Crowdsourced signal only (no registered tower) |
| Barigon | 2,221 | 1 | Crowdsourced signal only (no registered tower) |
| Bilibinwang | 2,085 | 3 | Crowdsourced signal only (no registered tower) |
| Coral Na Munti | 2,468 | 0 | Dead zone: no towers from any source |
| Guitna | 553 | 1 | Crowdsourced signal only (no registered tower) |
| Mabini | 825 | 0 | Dead zone: no towers from any source |
| Pamiga | 2,537 | 2 | Crowdsourced signal only (no registered tower) |
| Panhulan | 991 | 1 | Crowdsourced signal only (no registered tower) |
| Pansipit | 4,186 | 2 | Crowdsourced signal only (no registered tower) |
| Poblacion | 1,992 | 4 | Crowdsourced signal only (no registered tower) |
| Pook | 1,993 | 5 | Crowdsourced signal only (no registered tower) |
| San Jacinto | 6,171 | 1 | Crowdsourced signal only (no registered tower) |
| San Teodoro | 946 | 0 | Dead zone: no towers from any source |
| Santa Cruz | 923 | 1 | Crowdsourced signal only (no registered tower) |
| Santo Tomas | 824 | 1 | Crowdsourced signal only (no registered tower) |
| Subic Ibaba | 4,439 | 4 | Crowdsourced signal only (no registered tower) |
| Subic Ilaya | 6,088 | 10 | Crowdsourced signal only (no registered tower) |