Sasmuan (Sexmoan) comprises 12 barangays with an estimated population of 34,521. 10 of its barangays (83%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Batang 1st | 488 | 0 | Dead zone: no towers from any source |
| Batang 2nd | 187 | 0 | Dead zone: no towers from any source |
| Mabuanbuan | 130 | 0 | Dead zone: no towers from any source |
| Malusac | 944 | 0 | Dead zone: no towers from any source |
| San Antonio | 16,383 | 0 | Dead zone: no towers from any source |
| San Nicolas 1st | 1,543 | 0 | Dead zone: no towers from any source |
| San Nicolas 2nd | 708 | 0 | Dead zone: no towers from any source |
| San Pedro | 1,235 | 0 | Dead zone: no towers from any source |
| Santa Monica | 10,108 | 0 | Dead zone: no towers from any source |
| Santo Tomas | 1,924 | 1 | Crowdsourced signal only (no registered tower) |
| Sebitanan | 220 | 0 | Dead zone: no towers from any source |
| Sta. Lucia (Pob.) | 651 | 3 | Crowdsourced signal only (no registered tower) |