| 012901000 | ALILEM | ILOCOS SUR | REGION I (ILOCOS REGION) | 6695 | 4th |
| 012902000 | BANAYOYO | ILOCOS SUR | REGION I (ILOCOS REGION) | 7748 | 4th |
| 012903000 | BANTAY | ILOCOS SUR | REGION I (ILOCOS REGION) | 35731 | 3rd |
| 012904000 | BURGOS | ILOCOS SUR | REGION I (ILOCOS REGION) | 12224 | 4th |
| 012905000 | CABUGAO | ILOCOS SUR | REGION I (ILOCOS REGION) | 37501 | 1st |
| 012907000 | CAOAYAN | ILOCOS SUR | REGION I (ILOCOS REGION) | 19861 | 4th |
| 012908000 | CERVANTES | ILOCOS SUR | REGION I (ILOCOS REGION) | 17211 | 4th |
| 012909000 | GALIMUYOD | ILOCOS SUR | REGION I (ILOCOS REGION) | 10748 | 4th |
| 012910000 | GREGORIO DEL PILAR (CONCEPCION) | ILOCOS SUR | REGION I (ILOCOS REGION) | 4875 | 5th |
| 012911000 | LIDLIDDA | ILOCOS SUR | REGION I (ILOCOS REGION) | 4647 | 5th |
| 012912000 | MAGSINGAL | ILOCOS SUR | REGION I (ILOCOS REGION) | 30792 | 3rd |
| 012913000 | NAGBUKEL | ILOCOS SUR | REGION I (ILOCOS REGION) | 5259 | 5th |
| 012914000 | NARVACAN | ILOCOS SUR | REGION I (ILOCOS REGION) | 44006 | 2nd |
| 012915000 | QUIRINO (ANGKAKI) | ILOCOS SUR | REGION I (ILOCOS REGION) | 8573 | 4th |
| 012916000 | SALCEDO (BAUGEN) | ILOCOS SUR | REGION I (ILOCOS REGION) | 11288 | 4th |
| 012917000 | SAN EMILIO | ILOCOS SUR | REGION I (ILOCOS REGION) | 7407 | 4th |
| 012918000 | SAN ESTEBAN | ILOCOS SUR | REGION I (ILOCOS REGION) | 8349 | 5th |
| 012919000 | SAN ILDEFONSO | ILOCOS SUR | REGION I (ILOCOS REGION) | 7787 | 5th |
| 012920000 | SAN JUAN (LAPOG) | ILOCOS SUR | REGION I (ILOCOS REGION) | 26411 | 3rd |
| 012921000 | SAN VICENTE | ILOCOS SUR | REGION I (ILOCOS REGION) | 12758 | 5th |
| 012922000 | SANTA | ILOCOS SUR | REGION I (ILOCOS REGION) | 15340 | 4th |
| 012923000 | SANTA CATALINA | ILOCOS SUR | REGION I (ILOCOS REGION) | 13945 | 5th |
| 012924000 | SANTA CRUZ | ILOCOS SUR | REGION I (ILOCOS REGION) | 39868 | 1st |
| 012925000 | SANTA LUCIA | ILOCOS SUR | REGION I (ILOCOS REGION) | 25402 | 3rd |
| 012926000 | SANTA MARIA | ILOCOS SUR | REGION I (ILOCOS REGION) | 30321 | 3rd |
| 012927000 | SANTIAGO | ILOCOS SUR | REGION I (ILOCOS REGION) | 18759 | 4th |
| 012928000 | SANTO DOMINGO | ILOCOS SUR | REGION I (ILOCOS REGION) | 27975 | 3rd |
| 012929000 | SIGAY | ILOCOS SUR | REGION I (ILOCOS REGION) | 2737 | 5th |
| 012930000 | SINAIT | ILOCOS SUR | REGION I (ILOCOS REGION) | 25640 | 3rd |
| 012931000 | SUGPON | ILOCOS SUR | REGION I (ILOCOS REGION) | 4585 | 5th |
| 012932000 | SUYO | ILOCOS SUR | REGION I (ILOCOS REGION) | 11446 | 4th |
| 012933000 | TAGUDIN | ILOCOS SUR | REGION I (ILOCOS REGION) | 39277 | 2nd |