| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Abacca | city | Province of Ilocos Sur | Philippines | 17.0333333 | 120.5666667 | 1968 | 9248 |
| Abaccan | city | Province of Ilocos Sur | Philippines | 17.0333333 | 120.5666667 | 1968 | 9248 |
| Abaya | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.4666667 | 95 | 49346 |
| Abubutan | city | Province of Ilocos Sur | Philippines | 17.0333333 | 120.7666667 | 2158 | 6031 |
| Abuer | city | Province of Ilocos Sur | Philippines | 17.4166667 | 120.4833333 | 75 | 47768 |
| Abuor | city | Province of Ilocos Sur | Philippines | 17.4166667 | 120.4833333 | 75 | 47768 |
| Adagap | city | Province of Ilocos Sur | Philippines | 17.5 | 121.2833333 | 902 | 3854 |
| Adagapi | city | Province of Ilocos Sur | Philippines | 17.5 | 121.2833333 | 902 | 3854 |
| Ag-aguman | city | Province of Ilocos Sur | Philippines | 16.9286111 | 120.4722222 | 164 | 35683 |
| Agagrao | city | Province of Ilocos Sur | Philippines | 17.3833333 | 120.5166667 | 104 | 47793 |
| Aggay | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.4 | 16 | 92225 |
| Al-Aluding | city | Province of Ilocos Sur | Philippines | 17.2666667 | 120.4666667 | 111 | 34906 |
| Al-aludig | city | Province of Ilocos Sur | Philippines | 17.2666667 | 120.4666667 | 111 | 34906 |
| Alabog | city | Province of Ilocos Sur | Philippines | 17.7275 | 121.4758333 | 104 | 20263 |
| Alabug | city | Province of Ilocos Sur | Philippines | 17.7275 | 121.4758333 | 104 | 20263 |
| Alangan | city | Province of Ilocos Sur | Philippines | 17.6833333 | 120.3666667 | 16 | 14364 |
| Alangan | city | Province of Ilocos Sur | Philippines | 17.6833333 | 120.3833333 | 19 | 29976 |
| Alanjin | city | Province of Ilocos Sur | Philippines | 17.6833333 | 120.3666667 | 16 | 14364 |
| Alanjino | city | Province of Ilocos Sur | Philippines | 17.6833333 | 120.3666667 | 16 | 14364 |
| Alfonso | city | Province of Ilocos Sur | Philippines | 17.1694444 | 120.6108333 | 872 | 7737 |
| Alibangbang | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.4333333 | 127 | 32500 |
| Alilem | city | Province of Ilocos Sur | Philippines | 16.8880556 | 120.5291667 | 452 | 24676 |
| Alincaoeg | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.45 | 45 | 35098 |
| Allangigan | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.5 | 249 | 32179 |
| Allangigan | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.5 | 249 | 32179 |
| Allangigan Primero | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.5 | 249 | 32179 |
| Allangigan Segundo | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.5 | 249 | 32179 |
| Alulin | city | Province of Ilocos Sur | Philippines | 16.9788889 | 120.7619444 | 2027 | 7545 |
| Amarao | city | Province of Ilocos Sur | Philippines | 17.0602778 | 120.4852778 | 111 | 38465 |
| Amarga | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.5 | 55 | 25605 |
| Ambalayat | city | Province of Ilocos Sur | Philippines | 16.9205556 | 120.4938889 | 246 | 35683 |
| Ambocao | city | Province of Ilocos Sur | Philippines | 17.3 | 120.4166667 | 3 | 24405 |
| Ambucao | city | Province of Ilocos Sur | Philippines | 17.3 | 120.4166667 | 3 | 24405 |
| Ambugat | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.4833333 | 226 | 32306 |
| Ambuiogan-Labuac | city | Province of Ilocos Sur | Philippines | 17.455 | 120.4838889 | 88 | 47768 |
| Ambulogan | city | Province of Ilocos Sur | Philippines | 17.455 | 120.4838889 | 88 | 47768 |
| Ambulogan-Labuac | city | Province of Ilocos Sur | Philippines | 17.4666667 | 120.4833333 | 82 | 36286 |
| Ambulosan | city | Province of Ilocos Sur | Philippines | 17.455 | 120.4838889 | 88 | 47768 |
| Ambulugan | city | Province of Ilocos Sur | Philippines | 17.455 | 120.4838889 | 88 | 47768 |
| Amgayan | city | Province of Ilocos Sur | Philippines | 16.9666667 | 120.7166667 | 1968 | 6660 |
| Amgayang | city | Province of Ilocos Sur | Philippines | 16.9666667 | 120.7166667 | 1968 | 6660 |
| Amguid | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| Amilongan | city | Province of Ilocos Sur | Philippines | 16.8597222 | 120.58 | 872 | 7659 |
| Ampandula | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.4333333 | 127 | 32500 |
| Ampayao | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.5666667 | 1879 | 16561 |
| Ampoagan | city | Province of Ilocos Sur | Philippines | 17.35 | 120.5 | 72 | 39420 |
| Ampuagan | city | Province of Ilocos Sur | Philippines | 17.35 | 120.5 | 72 | 39420 |
| Amsawan | city | Province of Ilocos Sur | Philippines | 17.0855556 | 120.6727778 | 1640 | 3758 |
| An-ana-ao | city | Province of Ilocos Sur | Philippines | 17.1477778 | 120.6147222 | 1742 | 7653 |
| Anaao | city | Province of Ilocos Sur | Philippines | 16.8833333 | 120.55 | 849 | 11375 |
| Anan-nam | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
| Ancheta | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.5166667 | 328 | 25605 |
| Angaki | city | Province of Ilocos Sur | Philippines | 17.1555556 | 120.67 | 984 | 3669 |
| Anomang Mayor | city | Province of Ilocos Sur | Philippines | 17.55 | 120.3833333 | 16 | 92225 |
| Anonang Mayor | city | Province of Ilocos Sur | Philippines | 17.55 | 120.3833333 | 16 | 92225 |
| Ansad | city | Province of Ilocos Sur | Philippines | 17.3166667 | 120.45 | 426 | 24405 |
| Apang | city | Province of Ilocos Sur | Philippines | 16.8833333 | 120.5833333 | 1968 | 11375 |
| Apatot | city | Province of Ilocos Sur | Philippines | 17.3 | 120.4166667 | 3 | 24405 |
| Apaya | city | Province of Ilocos Sur | Philippines | 17.7666667 | 120.45 | 52 | 47112 |
| Apaya | city | Province of Ilocos Sur | Philippines | 16.8838889 | 120.5858333 | 1968 | 5696 |
| Aquib | city | Province of Ilocos Sur | Philippines | 17.45 | 120.4833333 | 101 | 47768 |
| Ar-aro | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.45 | 45 | 35098 |
| Aranaya | city | Province of Ilocos Sur | Philippines | 17.7 | 120.4166667 | 29 | 46641 |
| Arangin | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.5166667 | 95 | 38398 |
| Arangin-Dinaratan | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.5166667 | 95 | 38398 |
| Arangin-Dinaratan | city | Province of Ilocos Sur | Philippines | 17.1116667 | 120.5266667 | 656 | 38398 |
| Arnap | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.45 | 72 | 72043 |
| Asilang | city | Province of Ilocos Sur | Philippines | 17.7 | 120.45 | 111 | 46641 |
| Asilang | city | Province of Ilocos Sur | Philippines | 17.7183333 | 120.5097222 | 511 | 31514 |
| Atabay | city | Province of Ilocos Sur | Philippines | 17.15 | 120.5333333 | 104 | 37864 |
| Ayudante | city | Province of Ilocos Sur | Philippines | 17.1683333 | 120.4452778 | 55 | 40620 |
| Ayusan Norte | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.3833333 | 16 | 92225 |
| Ayusan Sur | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.3833333 | 16 | 92225 |
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