Santa Lucia comprises 36 barangays with an estimated population of 28,511. 28 of its barangays (78%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Alincaoeg | 393 | 0 | Dead zone: no towers from any source |
| Angkileng | 659 | 8 | Crowdsourced signal only (no registered tower) |
| Arangin | 329 | 0 | Dead zone: no towers from any source |
| Ayusan (Pob.) | 1,133 | 0 | Dead zone: no towers from any source |
| Banbanaba | 559 | 0 | Dead zone: no towers from any source |
| Bani | 1,303 | 0 | Dead zone: no towers from any source |
| Bao-as | 736 | 0 | Dead zone: no towers from any source |
| Barangobong (Pob.) | 1,437 | 3 | Crowdsourced signal only (no registered tower) |
| Buliclic | 918 | 0 | Dead zone: no towers from any source |
| Burgos (Pob.) | 449 | 0 | Dead zone: no towers from any source |
| Cabaritan | 390 | 0 | Dead zone: no towers from any source |
| Catayagan | 961 | 8 | Crowdsourced signal only (no registered tower) |
| Conconig East | 1,427 | 0 | Dead zone: no towers from any source |
| Conconig West | 712 | 0 | Dead zone: no towers from any source |
| Damacuag | 939 | 0 | Dead zone: no towers from any source |
| Luba | 1,203 | 0 | Dead zone: no towers from any source |
| Lubong | 440 | 0 | Dead zone: no towers from any source |
| Nagrebcan | 754 | 1 | Crowdsourced signal only (no registered tower) |
| Nagtablaan | 142 | 0 | Dead zone: no towers from any source |
| Namatican | 558 | 0 | Dead zone: no towers from any source |
| Nangalisan | 829 | 0 | Dead zone: no towers from any source |
| Palali Norte | 1,803 | 0 | Dead zone: no towers from any source |
| Palali Sur | 1,605 | 0 | Dead zone: no towers from any source |
| Paoc Norte | 514 | 0 | Dead zone: no towers from any source |
| Paoc Sur | 534 | 0 | Dead zone: no towers from any source |
| Paratong | 1,131 | 0 | Dead zone: no towers from any source |
| Pila East | 429 | 0 | Dead zone: no towers from any source |
| Pila West | 575 | 1 | Crowdsourced signal only (no registered tower) |
| Quinabalayangan | 199 | 0 | Dead zone: no towers from any source |
| Ronda | 572 | 7 | Crowdsourced signal only (no registered tower) |
| Sabuanan | 1,102 | 0 | Dead zone: no towers from any source |
| San Juan | 870 | 1 | Crowdsourced signal only (no registered tower) |
| San Pedro | 454 | 0 | Dead zone: no towers from any source |
| Sapang | 575 | 0 | Dead zone: no towers from any source |
| Suagayan | 674 | 1 | Crowdsourced signal only (no registered tower) |
| Vical | 1,203 | 0 | Dead zone: no towers from any source |