Calamba comprises 19 barangays with an estimated population of 22,168. 15 of its barangays (79%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bonifacio | 272 | 0 | Dead zone: no towers from any source |
| Bunawan | 1,140 | 0 | Dead zone: no towers from any source |
| Calaran | 1,625 | 0 | Dead zone: no towers from any source |
| Dapacan Alto | 811 | 0 | Dead zone: no towers from any source |
| Dapacan Bajo | 536 | 0 | Dead zone: no towers from any source |
| Don Bernardo Nery Pob. (Tres de Mayo) | 3,106 | 0 | Dead zone: no towers from any source |
| Langub | 1,557 | 0 | Dead zone: no towers from any source |
| Libertad | 200 | 0 | Dead zone: no towers from any source |
| Magcamiguing | 2,120 | 4 | Crowdsourced signal only (no registered tower) |
| Mamalad | 92 | 0 | Dead zone: no towers from any source |
| Mauswagon | 561 | 0 | Dead zone: no towers from any source |
| Northern Poblacion | 2,175 | 2 | Crowdsourced signal only (no registered tower) |
| Salvador | 327 | 0 | Dead zone: no towers from any source |
| San Isidro (San Isidro-San Pedro) | 168 | 0 | Dead zone: no towers from any source |
| Siloy | 352 | 0 | Dead zone: no towers from any source |
| Singalat | 54 | 0 | Dead zone: no towers from any source |
| Solinog | 2,840 | 1 | Crowdsourced signal only (no registered tower) |
| Southwestern Poblacion | 2,779 | 3 | Crowdsourced signal only (no registered tower) |
| Sulipat | 1,453 | 0 | Dead zone: no towers from any source |