| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Cabalangan | city | Province of Ilocos Sur | Philippines | 17.6 | 120.4333333 | 16 | 72043 |
| Cabalangegan | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
| Cabangaran | city | Province of Ilocos Sur | Philippines | 7.4833333 | 120.4333333 | 0 | 0 |
| Cabanglotan | city | Province of Ilocos Sur | Philippines | 17.75 | 120.45 | 45 | 48847 |
| Cabaritan | city | Province of Ilocos Sur | Philippines | 17.65 | 120.4 | 16 | 44749 |
| Cabaritan | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.4833333 | 62 | 48637 |
| Cabaroan | city | Province of Ilocos Sur | Philippines | 17.6 | 120.3833333 | 16 | 82684 |
| Cabaroan | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.4 | 16 | 92225 |
| Cabaroan | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.4 | 16 | 92225 |
| Cabaroan | city | Province of Ilocos Sur | Philippines | 17.7 | 120.4166667 | 29 | 46641 |
| Cabaroan | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.45 | 62 | 25396 |
| Cabaroan | city | Province of Ilocos Sur | Philippines | 17.3666667 | 120.5 | 72 | 39420 |
| Cabaroan | city | Province of Ilocos Sur | Philippines | 17.2394444 | 120.5641667 | 656 | 13841 |
| Cabaroan | city | Province of Ilocos Sur | Philippines | 17.4 | 120.7 | 488 | 10680 |
| Cabaruan | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.45 | 134 | 24405 |
| Cabaruan | city | Province of Ilocos Sur | Philippines | 17.8833333 | 120.4666667 | 114 | 34543 |
| Cabaruan | city | Province of Ilocos Sur | Philippines | 17.3666667 | 120.5 | 72 | 39420 |
| Cabcaburao | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.5 | 55 | 25605 |
| Cabigbigaan | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.4166667 | 52 | 54751 |
| Cabittaogan | city | Province of Ilocos Sur | Philippines | 17.5827778 | 120.3655556 | 16 | 62243 |
| Caboloan | city | Province of Ilocos Sur | Philippines | 17.6 | 120.3666667 | 16 | 51713 |
| Caborao | city | Province of Ilocos Sur | Philippines | 17.25 | 120.45 | 45 | 36480 |
| Caboroan | city | Province of Ilocos Sur | Philippines | 17.4333333 | 120.8 | 1400 | 5166 |
| Cabu-usan | city | Province of Ilocos Sur | Philippines | 17.9833333 | 120.5 | 164 | 25798 |
| Cabugao | city | Province of Ilocos Sur | Philippines | 17.7944444 | 120.4577778 | 42 | 37587 |
| Cabugao | city | Province of Ilocos Sur | Philippines | 16.9563889 | 120.4886111 | 262 | 35683 |
| Cabugbugan | city | Province of Ilocos Sur | Philippines | 16.9333333 | 120.45 | 167 | 30053 |
| Cabulalaan | city | Province of Ilocos Sur | Philippines | 17.0666667 | 120.4833333 | 131 | 38465 |
| Cabulalaan | city | Province of Ilocos Sur | Philippines | 17.9666667 | 120.6833333 | 239 | 27042 |
| Cabulanglangan | city | Province of Ilocos Sur | Philippines | 16.9166667 | 120.4666667 | 85 | 35683 |
| Caburao | city | Province of Ilocos Sur | Philippines | 17.25 | 120.45 | 45 | 36480 |
| Cabusligan | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.4166667 | 16 | 72043 |
| Cacaldingan | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.4 | 16 | 92225 |
| Cacandongan | city | Province of Ilocos Sur | Philippines | 17.7666667 | 120.45 | 52 | 47112 |
| Cadacad | city | Province of Ilocos Sur | Philippines | 17.4166667 | 120.4833333 | 75 | 47768 |
| Cadacad | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.5 | 55 | 25605 |
| Cadacad | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.5666667 | 492 | 22233 |
| Cadanglaan | city | Province of Ilocos Sur | Philippines | 17.25 | 120.4833333 | 118 | 40323 |
| Cadoog | city | Province of Ilocos Sur | Philippines | 17.45 | 120.5166667 | 82 | 45796 |
| Caellayan | city | Province of Ilocos Sur | Philippines | 17.8 | 120.4666667 | 19 | 42855 |
| Cagayungan | city | Province of Ilocos Sur | Philippines | 17.4 | 120.5 | 19 | 47793 |
| Calaoaan | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.45 | 62 | 25396 |
| Calaoaan | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.45 | 36 | 40620 |
| Calaohan | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.45 | 36 | 40620 |
| Calaotit | city | Province of Ilocos Sur | Philippines | 17.6666667 | 120.45 | 164 | 46641 |
| Calay-ab | city | Province of Ilocos Sur | Philippines | 17.6461111 | 120.3672222 | 16 | 24820 |
| Calimogtong | city | Province of Ilocos Sur | Philippines | 17.2 | 120.4833333 | 164 | 49346 |
| Calimugtong | city | Province of Ilocos Sur | Philippines | 17.2 | 120.4833333 | 164 | 49346 |
| Calingayan | city | Province of Ilocos Sur | Philippines | 17.85 | 120.4833333 | 118 | 37427 |
| Calioaquio | city | Province of Ilocos Sur | Philippines | 17.15 | 120.55 | 265 | 18570 |
| Callaguip | city | Province of Ilocos Sur | Philippines | 17.55 | 120.3833333 | 16 | 92225 |
| Callitong | city | Province of Ilocos Sur | Philippines | 17.3166667 | 120.5166667 | 328 | 25605 |
| Calongbuyan | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.4333333 | 127 | 32500 |
| Calongbuyan | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| Calongbuyan | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.4666667 | 95 | 49346 |
| Calumsing | city | Province of Ilocos Sur | Philippines | 17.2833333 | 120.55 | 656 | 13561 |
| Calungbuyan | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.4333333 | 127 | 32500 |
| Calungbuyan | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| Camangaan | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.4 | 16 | 92225 |
| Camindoroan | city | Province of Ilocos Sur | Philippines | 17.7494444 | 120.4355556 | 26 | 48847 |
| Candelaria | city | Province of Ilocos Sur | Philippines | 17.1741667 | 120.5252778 | 479 | 32179 |
| Candon | city | Province of Ilocos Sur | Philippines | 17.1947222 | 120.4516667 | 59 | 40620 |
| Cangao | city | Province of Ilocos Sur | Philippines | 17.1908333 | 120.6213889 | 1748 | 7737 |
| Caniogan | city | Province of Ilocos Sur | Philippines | 17.5 | 120.4333333 | 108 | 32500 |
| Caniogan Dacquel | city | Province of Ilocos Sur | Philippines | 17.5 | 120.4333333 | 108 | 32500 |
| Canogan Daquel | city | Province of Ilocos Sur | Philippines | 17.5 | 120.4333333 | 108 | 32500 |
| Canteng | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.7 | 984 | 3745 |
| Canuguan | city | Province of Ilocos Sur | Philippines | 17.7333333 | 121.4166667 | 374 | 12606 |
| Caoayan | city | Province of Ilocos Sur | Philippines | 17.5619444 | 120.3975 | 16 | 92225 |
| Caoayan | city | Province of Ilocos Sur | Philippines | 16.85 | 120.5166667 | 465 | 19330 |
| Capangdanan | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
| Capangpangan | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
| Capariaan | city | Province of Ilocos Sur | Philippines | 17.55 | 120.4 | 16 | 92225 |
| Capariaan | city | Province of Ilocos Sur | Philippines | 17.0333333 | 120.45 | 49 | 17210 |
| Capinitan | city | Province of Ilocos Sur | Philippines | 17.0666667 | 120.5666667 | 1850 | 13399 |
| Cappa-Cappa | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.4666667 | 150 | 32306 |
| Caraisan | city | Province of Ilocos Sur | Philippines | 17.7166667 | 120.45 | 78 | 48847 |
| Carcarabasa | city | Province of Ilocos Sur | Philippines | 17.25 | 120.5166667 | 255 | 25542 |
| Carmay | city | Province of Ilocos Sur | Philippines | 17.65 | 120.45 | 177 | 54751 |
| Caronoan | city | Province of Ilocos Sur | Philippines | 17.75 | 120.4666667 | 187 | 52649 |
| Caronuan | city | Province of Ilocos Sur | Philippines | 17.75 | 120.4666667 | 187 | 52649 |
| Casay | city | Province of Ilocos Sur | Philippines | 17.4172222 | 120.5144444 | 164 | 45796 |
| Caset | city | Province of Ilocos Sur | Philippines | 17.8333333 | 120.5166667 | 328 | 24653 |
| Casiber | city | Province of Ilocos Sur | Philippines | 17.5 | 120.4166667 | 19 | 32500 |
| Casilagan | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.45 | 62 | 25396 |
| Casilagan | city | Province of Ilocos Sur | Philippines | 17.25 | 120.4833333 | 118 | 40323 |
| Casilagan | city | Province of Ilocos Sur | Philippines | 17.4166667 | 120.4833333 | 75 | 47768 |
| Casilagan | city | Province of Ilocos Sur | Philippines | 17.4666667 | 120.55 | 91 | 22233 |
| Casili | city | Province of Ilocos Sur | Philippines | 17.6666667 | 120.3833333 | 29 | 29976 |
| Catarman | city | Province of Ilocos Sur | Philippines | 17.2036111 | 120.4213889 | 19 | 40620 |
| Catayagan | city | Province of Ilocos Sur | Philippines | 17.1333333 | 120.45 | 104 | 40802 |
| Catcateng | city | Province of Ilocos Sur | Philippines | 17.0166667 | 120.7333333 | 1486 | 5338 |
| Caterman | city | Province of Ilocos Sur | Philippines | 17.2036111 | 120.4213889 | 19 | 40620 |
| Cavayan | city | Province of Ilocos Sur | Philippines | 17.5619444 | 120.3975 | 16 | 92225 |
| Cayus | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.6666667 | 915 | 3745 |
| Cerna | city | Province of Ilocos Sur | Philippines | 17.5166667 | 120.4 | 6 | 68022 |
| Cervantes | city | Province of Ilocos Sur | Philippines | 16.9916667 | 120.7344444 | 1640 | 6660 |
| Codoog | city | Province of Ilocos Sur | Philippines | 17.4666667 | 120.5333333 | 164 | 30562 |
| Colasan | city | Province of Ilocos Sur | Philippines | 17.5166667 | 121.4 | 656 | 5827 |
| Colayanan | city | Province of Ilocos Sur | Philippines | 17.6166667 | 121.4 | 328 | 5478 |
| Colili | city | Province of Ilocos Sur | Philippines | 16.8166667 | 120.5666667 | 2952 | 7720 |
| Collong | city | Province of Ilocos Sur | Philippines | 17.15 | 120.55 | 265 | 18570 |
| Comillas | city | Province of Ilocos Sur | Philippines | 16.9605556 | 120.7475 | 1640 | 6660 |
| Concepcion | city | Province of Ilocos Sur | Philippines | 17.1302778 | 120.6119444 | 1148 | 7653 |
| Conconig | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.45 | 45 | 35098 |
| Coscosnong | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.45 | 62 | 25396 |
| Cosocos | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.5833333 | 984 | 22233 |
| Cosucos | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.5833333 | 984 | 22233 |
| Cubcubbu-ot | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.5 | 249 | 32179 |
| Cucubbuot | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| Culili | city | Province of Ilocos Sur | Philippines | 16.8166667 | 120.5666667 | 2952 | 7720 |
| Cullabeng | city | Province of Ilocos Sur | Philippines | 17.9666667 | 120.5166667 | 134 | 25798 |
| Culliang | city | Province of Ilocos Sur | Philippines | 16.7986111 | 120.5847222 | 2952 | 3675 |
| Cuta | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
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