San Dionisio comprises 29 barangays with an estimated population of 37,158. 16 of its barangays (55%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Agdaliran | 870 | 1 | Crowdsourced signal only (no registered tower) |
| Amayong | 199 | 0 | Dead zone: no towers from any source |
| Bagacay | 1,555 | 4 | Crowdsourced signal only (no registered tower) |
| Batuan | 181 | 0 | Dead zone: no towers from any source |
| Bondulan | 2,695 | 0 | Dead zone: no towers from any source |
| Boroñgon | 872 | 0 | Dead zone: no towers from any source |
| Canas | 1,197 | 3 | Crowdsourced signal only (no registered tower) |
| Capinang | 1,072 | 0 | Dead zone: no towers from any source |
| Cubay | 1,828 | 1 | Crowdsourced signal only (no registered tower) |
| Cudionan | 1,100 | 1 | Crowdsourced signal only (no registered tower) |
| Dugman | 1,129 | 5 | Crowdsourced signal only (no registered tower) |
| Hacienda Conchita | 826 | 2 | Crowdsourced signal only (no registered tower) |
| Madanlog | 1,184 | 2 | Crowdsourced signal only (no registered tower) |
| Mandu-awak | 2,422 | 0 | Dead zone: no towers from any source |
| Moto | 138 | 0 | Dead zone: no towers from any source |
| Naborot | 39 | 0 | Dead zone: no towers from any source |
| Nipa | 186 | 0 | Dead zone: no towers from any source |
| Odiongan | 818 | 0 | Dead zone: no towers from any source |
| Pangi | 3,203 | 0 | Dead zone: no towers from any source |
| Pase | 1,037 | 1 | Crowdsourced signal only (no registered tower) |
| Poblacion | 2,803 | 1 | Crowdsourced signal only (no registered tower) |
| San Nicolas | 1,589 | 0 | Dead zone: no towers from any source |
| Santol | 657 | 1 | Crowdsourced signal only (no registered tower) |
| Siempreviva | 3,103 | 1 | Crowdsourced signal only (no registered tower) |
| Sua | 802 | 0 | Dead zone: no towers from any source |
| Talo-ato | 1,401 | 0 | Dead zone: no towers from any source |
| Tamangi | 1,094 | 0 | Dead zone: no towers from any source |
| Tiabas | 1,827 | 0 | Dead zone: no towers from any source |
| Tuble | 1,331 | 2 | Crowdsourced signal only (no registered tower) |