San Leonardo comprises 15 barangays with an estimated population of 69,449. 2 of its barangays (13%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Bonifacio District (Pob.) | 3,425 | 1 | Crowdsourced signal only (no registered tower) |
| Burgos District (Pob.) | 1,257 | 0 | Dead zone: no towers from any source |
| Castellano | 4,111 | 23 | Crowdsourced signal only (no registered tower) |
| Diversion | 6,942 | 37 | Crowdsourced signal only (no registered tower) |
| Magpapalayoc | 4,804 | 7 | Crowdsourced signal only (no registered tower) |
| Mallorca | 8,132 | 2 | Crowdsourced signal only (no registered tower) |
| Mambangnan | 8,632 | 4 | Crowdsourced signal only (no registered tower) |
| Nieves | 8,865 | 11 | Crowdsourced signal only (no registered tower) |
| Rizal District (Pob.) | 1,664 | 1 | Crowdsourced signal only (no registered tower) |
| San Anton | 6,492 | 6 | Crowdsourced signal only (no registered tower) |
| San Bartolome (Pob.) | 2,066 | 2 | Crowdsourced signal only (no registered tower) |
| San Roque | 1,631 | 3 | Crowdsourced signal only (no registered tower) |
| Tabuating | 8,126 | 12 | Crowdsourced signal only (no registered tower) |
| Tagumpay | 410 | 0 | Dead zone: no towers from any source |
| Tambo Adorable | 2,892 | 4 | Crowdsourced signal only (no registered tower) |