UpAlphabetical listing of Places in Ilocos Sur
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Abacca | city | Ilocos Sur | Philippines | 17.03 | 120.57 | 1968 | 5214 |
| Abaccan | city | Ilocos Sur | Philippines | 17.03 | 120.57 | 1968 | 5214 |
| Abaya | city | Ilocos Sur | Philippines | 17.18 | 120.47 | 95 | 51393 |
| Abour | city | Ilocos Sur | Philippines | 17.43 | 120.48 | 82 | 49158 |
| Abubutan | city | Ilocos Sur | Philippines | 17.03 | 120.77 | 2509 | 4249 |
| Abuer | city | Ilocos Sur | Philippines | 17.43 | 120.48 | 82 | 49158 |
| Abuor | city | Ilocos Sur | Philippines | 17.43 | 120.48 | 82 | 49158 |
| Agagrao | city | Ilocos Sur | Philippines | 17.38 | 120.51 | 108 | 47176 |
| Agaguman | city | Ilocos Sur | Philippines | 16.93 | 120.47 | 164 | 38427 |
| Aggay | city | Ilocos Sur | Philippines | 17.59 | 120.41 | 16 | 89135 |
| Aguing | city | Ilocos Sur | Philippines | 17.87 | 120.49 | 141 | 36618 |
| Al-Aluding | city | Ilocos Sur | Philippines | 17.27 | 120.47 | 111 | 34628 |
| Alaludig | city | Ilocos Sur | Philippines | 17.27 | 120.47 | 111 | 34628 |
| Alangan | city | Ilocos Sur | Philippines | 17.68 | 120.37 | 16 | 21990 |
| Alangan | city | Ilocos Sur | Philippines | 17.68 | 120.38 | 26 | 25130 |
| Alanjin | city | Ilocos Sur | Philippines | 17.68 | 120.37 | 16 | 21990 |
| Alanjino | city | Ilocos Sur | Philippines | 17.68 | 120.37 | 16 | 21990 |
| Alfonso | city | Ilocos Sur | Philippines | 17.17 | 120.61 | 872 | 4970 |
| Alibangbang | city | Ilocos Sur | Philippines | 17.48 | 120.43 | 127 | 26829 |
| Alilem | city | Ilocos Sur | Philippines | 16.89 | 120.53 | 830 | 18847 |
| Alincaoeg | city | Ilocos Sur | Philippines | 17.14 | 120.46 | 82 | 52195 |
| Allangigan | city | Ilocos Sur | Philippines | 17.17 | 120.49 | 226 | 43575 |
| Allangigan | city | Ilocos Sur | Philippines | 17.17 | 120.49 | 226 | 43575 |
| Allangigan Primero | city | Ilocos Sur | Philippines | 17.17 | 120.49 | 226 | 43575 |
| Allangigan Segundo | city | Ilocos Sur | Philippines | 17.17 | 120.49 | 226 | 43575 |
| Allangigan Segundo | city | Ilocos Sur | Philippines | 17.16 | 120.48 | 82 | 48503 |
| Alulin | city | Ilocos Sur | Philippines | 16.98 | 120.76 | 1968 | 5711 |
| Amarao | city | Ilocos Sur | Philippines | 17.06 | 120.48 | 111 | 40402 |
| Amarga | city | Ilocos Sur | Philippines | 17.33 | 120.50 | 55 | 31636 |
| Ambalayan | city | Ilocos Sur | Philippines | 16.92 | 120.49 | 246 | 33143 |
| Ambalayat | city | Ilocos Sur | Philippines | 16.92 | 120.49 | 246 | 33143 |
| Ambocao | city | Ilocos Sur | Philippines | 17.30 | 120.42 | 164 | 18847 |
| Ambucao | city | Ilocos Sur | Philippines | 17.30 | 120.42 | 164 | 18847 |
| Ambugat | city | Ilocos Sur | Philippines | 17.33 | 120.48 | 226 | 34168 |
| Ambuiogan-Labuac | city | Ilocos Sur | Philippines | 17.47 | 120.50 | 328 | 36352 |
| Ambulogan | city | Ilocos Sur | Philippines | 17.47 | 120.50 | 328 | 36352 |
| Ambulogan-Labuac | city | Ilocos Sur | Philippines | 17.47 | 120.49 | 108 | 36352 |
| Ambulosan | city | Ilocos Sur | Philippines | 17.47 | 120.50 | 328 | 36352 |
| Ambulugan | city | Ilocos Sur | Philippines | 17.47 | 120.50 | 328 | 36352 |
| Amgayan | city | Ilocos Sur | Philippines | 16.98 | 120.73 | 1669 | 5797 |
| Amgayang | city | Ilocos Sur | Philippines | 16.98 | 120.73 | 1669 | 5797 |
| Amguid | city | Ilocos Sur | Philippines | 17.20 | 120.45 | 39 | 45061 |
| Amilongan | city | Ilocos Sur | Philippines | 16.86 | 120.58 | 872 | 3984 |
| Amilongon | city | Ilocos Sur | Philippines | 16.86 | 120.58 | 872 | 3984 |
| Amilongon | city | Ilocos Sur | Philippines | 16.88 | 120.55 | 830 | 11816 |
| Ampandula | city | Ilocos Sur | Philippines | 17.53 | 120.45 | 328 | 58311 |
| Ampayao | city | Ilocos Sur | Philippines | 17.17 | 120.57 | 1879 | 12415 |
| Ampoagan | city | Ilocos Sur | Philippines | 17.36 | 120.50 | 82 | 42650 |
| Ampontoc | city | Ilocos Sur | Philippines | 16.95 | 120.78 | 3349 | 7130 |
| Ampuagan | city | Ilocos Sur | Philippines | 17.36 | 120.50 | 82 | 42650 |
| Amsawan | city | Ilocos Sur | Philippines | 17.09 | 120.67 | 1669 | 3474 |
| An- Annam | city | Ilocos Sur | Philippines | 17.61 | 120.43 | 19 | 72950 |
| An-ana-ao | city | Ilocos Sur | Philippines | 17.15 | 120.61 | 1742 | 4639 |
| Anaao | city | Ilocos Sur | Philippines | 16.89 | 120.55 | 849 | 13522 |
| Anan-nam | city | Ilocos Sur | Philippines | 17.61 | 120.43 | 19 | 72950 |
| Ananao | city | Ilocos Sur | Philippines | 16.89 | 120.55 | 849 | 13522 |
| Ancheta | city | Ilocos Sur | Philippines | 17.33 | 120.52 | 328 | 26062 |
| Angaki | city | Ilocos Sur | Philippines | 17.16 | 120.67 | 984 | 3729 |
| Anomang Mayor | city | Ilocos Sur | Philippines | 17.55 | 120.39 | 16 | 90046 |
| Anonang Mayor | city | Ilocos Sur | Philippines | 17.55 | 120.39 | 16 | 90046 |
| Ansad | city | Ilocos Sur | Philippines | 17.33 | 120.46 | 154 | 28030 |
| Apang | city | Ilocos Sur | Philippines | 16.87 | 120.59 | 984 | 3968 |
| Apatot | city | Ilocos Sur | Philippines | 17.32 | 120.43 | 55 | 19146 |
| Apaya | city | Ilocos Sur | Philippines | 17.90 | 120.45 | 78 | 20449 |
| Apaya | city | Ilocos Sur | Philippines | 16.88 | 120.58 | 1968 | 4373 |
| Apaya | city | Ilocos Sur | Philippines | 17.77 | 120.45 | 52 | 55521 |
| Aquib | city | Ilocos Sur | Philippines | 17.43 | 120.49 | 85 | 49364 |
| Ar-aro | city | Ilocos Sur | Philippines | 17.12 | 120.45 | 45 | 46625 |
| Aranaya | city | Ilocos Sur | Philippines | 17.70 | 120.41 | 32 | 33262 |
| Arangin | city | Ilocos Sur | Philippines | 17.12 | 120.52 | 95 | 39670 |
| Arangin-Dinaratan | city | Ilocos Sur | Philippines | 17.11 | 120.53 | 830 | 33203 |
| Arangin-Dinaratan | city | Ilocos Sur | Philippines | 17.12 | 120.52 | 95 | 39670 |
| Arinaya | city | Ilocos Sur | Philippines | 17.70 | 120.41 | 32 | 33262 |
| Arnap | city | Ilocos Sur | Philippines | 17.62 | 120.45 | 72 | 52717 |
| Arnap | city | Ilocos Sur | Philippines | 17.78 | 120.49 | 164 | 46812 |
| Asilang | city | Ilocos Sur | Philippines | 17.71 | 120.48 | 830 | 46926 |
| Asilang | city | Ilocos Sur | Philippines | 17.72 | 120.51 | 830 | 33564 |
| Asin | city | Ilocos Sur | Philippines | 17.28 | 120.56 | 387 | 12123 |
| Atabay | city | Ilocos Sur | Philippines | 17.15 | 120.53 | 104 | 30554 |
| Ayon | city | Ilocos Sur | Philippines | 17.86 | 120.51 | 275 | 34451 |
| Ayon | city | Ilocos Sur | Philippines | 17.83 | 120.49 | 187 | 36415 |
| Ayudante | city | Ilocos Sur | Philippines | 17.17 | 120.44 | 55 | 40234 |
| Ayusan Norte | city | Ilocos Sur | Philippines | 17.57 | 120.38 | 16 | 88165 |
| Ayusan Sur | city | Ilocos Sur | Philippines | 17.56 | 120.37 | 16 | 78981 |
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