Alfonso comprises 32 barangays with an estimated population of 54,038. 8 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 |
|---|---|---|---|
| Amuyong | 1,606 | 32 | Crowdsourced signal only (no registered tower) |
| Barangay I (Pob.) | 331 | 0 | Dead zone: no towers from any source |
| Barangay II (Pob.) | 382 | 4 | Crowdsourced signal only (no registered tower) |
| Barangay III (Pob.) | 321 | 3 | Crowdsourced signal only (no registered tower) |
| Barangay IV (Pob.) | 1,817 | 2 | Crowdsourced signal only (no registered tower) |
| Barangay V (Pob.) | 1,915 | 1 | Crowdsourced signal only (no registered tower) |
| Bilog | 1,070 | 0 | Dead zone: no towers from any source |
| Buck Estate | 3,223 | 15 | Crowdsourced signal only (no registered tower) |
| Esperanza Ibaba | 1,153 | 0 | Dead zone: no towers from any source |
| Esperanza Ilaya | 1,684 | 0 | Dead zone: no towers from any source |
| Kaysuyo | 2,806 | 1 | Crowdsourced signal only (no registered tower) |
| Kaytitinga I | 2,374 | 1 | Crowdsourced signal only (no registered tower) |
| Kaytitinga II | 2,470 | 1 | Crowdsourced signal only (no registered tower) |
| Kaytitinga III | 1,766 | 5 | Crowdsourced signal only (no registered tower) |
| Luksuhin | 1,941 | 6 | Crowdsourced signal only (no registered tower) |
| Luksuhin Ilaya | 3,070 | 8 | Crowdsourced signal only (no registered tower) |
| Mangas I | 2,139 | 2 | Crowdsourced signal only (no registered tower) |
| Mangas II | 1,701 | 6 | Crowdsourced signal only (no registered tower) |
| Marahan I | 2,602 | 3 | Crowdsourced signal only (no registered tower) |
| Marahan II | 1,623 | 1 | Crowdsourced signal only (no registered tower) |
| Matagbak I | 1,641 | 4 | Crowdsourced signal only (no registered tower) |
| Matagbak II | 540 | 0 | Dead zone: no towers from any source |
| Pajo | 2,475 | 4 | Crowdsourced signal only (no registered tower) |
| Palumlum | 1,062 | 1 | Crowdsourced signal only (no registered tower) |
| Santa Teresa | 1,128 | 0 | Dead zone: no towers from any source |
| Sikat | 1,657 | 27 | Crowdsourced signal only (no registered tower) |
| Sinaliw Malaki | 1,963 | 0 | Dead zone: no towers from any source |
| Sinaliw na Munti | 521 | 0 | Dead zone: no towers from any source |
| Sulsugin | 1,407 | 1 | Crowdsourced signal only (no registered tower) |
| Taywanak Ibaba | 1,453 | 6 | Crowdsourced signal only (no registered tower) |
| Taywanak Ilaya | 3,321 | 6 | Crowdsourced signal only (no registered tower) |
| Upli | 876 | 13 | Crowdsourced signal only (no registered tower) |