Pagsanjan comprises 16 barangays with an estimated population of 51,218. 4 of its barangays (25%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Anibong | 660 | 0 | Dead zone: no towers from any source |
| Barangay I (Pob.) | 969 | 3 | Crowdsourced signal only (no registered tower) |
| Barangay II (Pob.) | 2,970 | 4 | Crowdsourced signal only (no registered tower) |
| Biñan | 11,014 | 18 | Crowdsourced signal only (no registered tower) |
| Buboy | 1,557 | 1 | Crowdsourced signal only (no registered tower) |
| Cabanbanan | 5,760 | 4 | Crowdsourced signal only (no registered tower) |
| Calusiche | 491 | 1 | Crowdsourced signal only (no registered tower) |
| Dingin | 297 | 0 | Dead zone: no towers from any source |
| Lambac | 2,330 | 0 | Dead zone: no towers from any source |
| Layugan | 140 | 0 | Dead zone: no towers from any source |
| Magdapio | 1,512 | 5 | Crowdsourced signal only (no registered tower) |
| Maulawin | 6,245 | 4 | Crowdsourced signal only (no registered tower) |
| Pinagsanjan | 3,286 | 11 | Crowdsourced signal only (no registered tower) |
| Sabang | 4,036 | 2 | Crowdsourced signal only (no registered tower) |
| Sampaloc | 6,091 | 10 | Crowdsourced signal only (no registered tower) |
| San Isidro | 3,860 | 7 | Crowdsourced signal only (no registered tower) |