Santa Margarita comprises 36 barangays with an estimated population of 27,762. 35 of its barangays (97%) are connectivity dead zones with no recorded cell tower from either the national registry or crowdsourced data.
| Barangay | Population | Towers | Coverage |
|---|---|---|---|
| Agrupacion | 76 | 0 | Dead zone: no towers from any source |
| Arapison | 182 | 0 | Dead zone: no towers from any source |
| Avelino | 297 | 0 | Dead zone: no towers from any source |
| Bahay | 333 | 0 | Dead zone: no towers from any source |
| Balud | 1,971 | 0 | Dead zone: no towers from any source |
| Bana-ao | 301 | 0 | Dead zone: no towers from any source |
| Burabod | 2,810 | 0 | Dead zone: no towers from any source |
| Cagsumji | 812 | 0 | Dead zone: no towers from any source |
| Campeig | 169 | 0 | Dead zone: no towers from any source |
| Camperito | 216 | 0 | Dead zone: no towers from any source |
| Can-ipulan | 413 | 0 | Dead zone: no towers from any source |
| Canmoros | 237 | 0 | Dead zone: no towers from any source |
| Cautod (Pob.) | 2,749 | 0 | Dead zone: no towers from any source |
| Cinco | 816 | 0 | Dead zone: no towers from any source |
| Curry | 587 | 0 | Dead zone: no towers from any source |
| Gajo | 256 | 0 | Dead zone: no towers from any source |
| Hindang | 217 | 0 | Dead zone: no towers from any source |
| Ilo | 1,130 | 0 | Dead zone: no towers from any source |
| Imelda | 177 | 0 | Dead zone: no towers from any source |
| Inoraguiao | 1,846 | 0 | Dead zone: no towers from any source |
| Jolacao | 77 | 0 | Dead zone: no towers from any source |
| Lambao | 2,273 | 0 | Dead zone: no towers from any source |
| Mabuhay | 175 | 0 | Dead zone: no towers from any source |
| Mahayag | 174 | 0 | Dead zone: no towers from any source |
| Matayonas | 66 | 0 | Dead zone: no towers from any source |
| Monbon (Pob.) | 2,948 | 0 | Dead zone: no towers from any source |
| Nabulo | 233 | 0 | Dead zone: no towers from any source |
| Napuro | 1,215 | 0 | Dead zone: no towers from any source |
| Napuro II | 950 | 0 | Dead zone: no towers from any source |
| Palale | 1,630 | 0 | Dead zone: no towers from any source |
| Panabatan | 261 | 0 | Dead zone: no towers from any source |
| Panaruan | 162 | 0 | Dead zone: no towers from any source |
| Roxas | 114 | 0 | Dead zone: no towers from any source |
| Salvacion | 174 | 0 | Dead zone: no towers from any source |
| Solsogon | 1,124 | 1 | Crowdsourced signal only (no registered tower) |
| Sundara | 591 | 0 | Dead zone: no towers from any source |