Mercedes comprises 16 barangays with an estimated population of 4,989. 10 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 |
|---|---|---|---|
| Anuron | 514 | 0 | Dead zone: no towers from any source |
| Banuyo | 293 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay 1 Poblacion | 252 | 0 | Dead zone: no towers from any source |
| Barangay 2 Poblacion | 226 | 1 | Crowdsourced signal only (no registered tower) |
| Barangay 3 Poblacion | 311 | 0 | Dead zone: no towers from any source |
| Barangay 4 Poblacion | 365 | 0 | Dead zone: no towers from any source |
| Bobon | 317 | 0 | Dead zone: no towers from any source |
| Busay | 250 | 1 | Crowdsourced signal only (no registered tower) |
| Buyayawon | 453 | 2 | Crowdsourced signal only (no registered tower) |
| Cabunga-an | 237 | 0 | Dead zone: no towers from any source |
| Cambante | 119 | 0 | Dead zone: no towers from any source |
| Palamrag (Cabiliri-an) | 310 | 2 | Crowdsourced signal only (no registered tower) |
| Port Kennedy | 108 | 0 | Dead zone: no towers from any source |
| San Jose | 427 | 0 | Dead zone: no towers from any source |
| San Roque | 298 | 0 | Dead zone: no towers from any source |
| Sung-an | 509 | 1 | Crowdsourced signal only (no registered tower) |