| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Labnig | city | Province of Ilocos Sur | Philippines | 17.7833333 | 120.4666667 | 65 | 50916 |
| Labut | city | Province of Ilocos Sur | Philippines | 17.5 | 120.4333333 | 108 | 32500 |
| Labut Sur | city | Province of Ilocos Sur | Philippines | 17.5 | 120.4333333 | 108 | 32500 |
| Lagalit | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.45 | 328 | 54751 |
| Lagatit | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.4 | 36 | 44749 |
| Laglagan | city | Province of Ilocos Sur | Philippines | 16.9 | 120.5833333 | 1174 | 11375 |
| Lamag | city | Province of Ilocos Sur | Philippines | 17.1461111 | 120.7277778 | 1919 | 2532 |
| Lancuas | city | Province of Ilocos Sur | Philippines | 17.2552778 | 120.5916667 | 833 | 8101 |
| Lancuay | city | Province of Ilocos Sur | Philippines | 17.2552778 | 120.5916667 | 833 | 8101 |
| Lang-ayan | city | Province of Ilocos Sur | Philippines | 17.2833333 | 120.4333333 | 85 | 31043 |
| Langab | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.6 | 656 | 7122 |
| Langlanca Primero | city | Province of Ilocos Sur | Philippines | 17.2283333 | 120.4525 | 82 | 36480 |
| Langlanca Segundo | city | Province of Ilocos Sur | Philippines | 17.2333333 | 120.45 | 78 | 36480 |
| Langlangca | city | Province of Ilocos Sur | Philippines | 17.2333333 | 120.45 | 78 | 36480 |
| Langlangca | city | Province of Ilocos Sur | Philippines | 17.2283333 | 120.4525 | 82 | 36480 |
| Langlangca Primero | city | Province of Ilocos Sur | Philippines | 17.2283333 | 120.4525 | 82 | 36480 |
| Langlangca Segundo | city | Province of Ilocos Sur | Philippines | 17.2333333 | 120.45 | 78 | 36480 |
| Langoyan | city | Province of Ilocos Sur | Philippines | 17.3 | 120.6166667 | 1968 | 9526 |
| Lanipao | city | Province of Ilocos Sur | Philippines | 17.4166667 | 120.4666667 | 78 | 47768 |
| Lanipao | city | Province of Ilocos Sur | Philippines | 17.4872222 | 120.5208333 | 206 | 30562 |
| Lantag | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.45 | 62 | 25396 |
| Laoingen | city | Province of Ilocos Sur | Philippines | 17.65 | 120.4666667 | 656 | 42724 |
| Lapog | city | Province of Ilocos Sur | Philippines | 17.7422222 | 120.4583333 | 55 | 48847 |
| Lapting | city | Province of Ilocos Sur | Philippines | 17.7666667 | 120.4666667 | 108 | 50916 |
| Lapting | city | Province of Ilocos Sur | Philippines | 17.45 | 120.5333333 | 164 | 45796 |
| Laslasong | city | Province of Ilocos Sur | Philippines | 17.3833333 | 120.5 | 78 | 47793 |
| Laslasong West | city | Province of Ilocos Sur | Philippines | 17.3833333 | 120.5 | 78 | 47793 |
| Latad | city | Province of Ilocos Sur | Philippines | 17.6833333 | 120.45 | 114 | 46641 |
| Latoo | city | Province of Ilocos Sur | Philippines | 17.6833333 | 120.45 | 114 | 46641 |
| Legaspi | city | Province of Ilocos Sur | Philippines | 17.2 | 120.5166667 | 246 | 32179 |
| Legleg | city | Province of Ilocos Sur | Philippines | 17.1366667 | 120.6783333 | 1148 | 3669 |
| Lepanan | city | Province of Ilocos Sur | Philippines | 16.9333333 | 120.5333333 | 1640 | 24777 |
| Libang | city | Province of Ilocos Sur | Philippines | 17.05 | 120.6833333 | 1525 | 4487 |
| Liblibo | city | Province of Ilocos Sur | Philippines | 16.8833333 | 120.6 | 2864 | 5696 |
| Liblong | city | Province of Ilocos Sur | Philippines | 16.9675 | 120.4441667 | 98 | 19553 |
| Libong | city | Province of Ilocos Sur | Philippines | 16.9833333 | 120.5166667 | 265 | 21221 |
| Libtong | city | Province of Ilocos Sur | Philippines | 16.9675 | 120.4441667 | 98 | 19553 |
| Lidaoan | city | Province of Ilocos Sur | Philippines | 17.2133333 | 120.6616667 | 2454 | 5205 |
| Lidlida | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.7833333 | 3375 | 1521 |
| Lidlidda | city | Province of Ilocos Sur | Philippines | 17.2719444 | 120.5219444 | 118 | 23346 |
| Lidug | city | Province of Ilocos Sur | Philippines | 17.5333333 | 120.4333333 | 13 | 58129 |
| Lieseb | city | Province of Ilocos Sur | Philippines | 17.25 | 120.6333333 | 1414 | 5205 |
| Limu | city | Province of Ilocos Sur | Philippines | 16.85 | 120.6166667 | 2296 | 3911 |
| Lingsat | city | Province of Ilocos Sur | Philippines | 17.3833333 | 120.45 | 59 | 25699 |
| Lingsat | city | Province of Ilocos Sur | Philippines | 17.6127778 | 120.4575 | 216 | 72043 |
| Lintic | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.5 | 82 | 25542 |
| Lipnit | city | Province of Ilocos Sur | Philippines | 17.7666667 | 120.4833333 | 239 | 50916 |
| Llang | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.4333333 | 82 | 24405 |
| Lobung | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.45 | 45 | 35098 |
| Loco | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.4666667 | 95 | 49346 |
| Longboy | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.3833333 | 26 | 44749 |
| Lopez | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.5 | 82 | 25542 |
| Luba | city | Province of Ilocos Sur | Philippines | 17.1333333 | 120.4333333 | 59 | 40802 |
| Lubnac | city | Province of Ilocos Sur | Philippines | 16.9333333 | 120.4333333 | 147 | 30053 |
| Lubnac | city | Province of Ilocos Sur | Philippines | 17.0166667 | 120.5333333 | 984 | 21541 |
| Lubong | city | Province of Ilocos Sur | Philippines | 17.6 | 120.35 | 16 | 51713 |
| Lubong | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.45 | 45 | 35098 |
| Lubong | city | Province of Ilocos Sur | Philippines | 17.35 | 120.4833333 | 101 | 40757 |
| Lucbaoan | city | Province of Ilocos Sur | Philippines | 17.1333333 | 120.5333333 | 111 | 37864 |
| Lucboba | city | Province of Ilocos Sur | Philippines | 17.1333333 | 120.5333333 | 111 | 37864 |
| Lucbuban | city | Province of Ilocos Sur | Philippines | 17.1333333 | 120.5333333 | 111 | 37864 |
| Lucbuben | city | Province of Ilocos Sur | Philippines | 17.1333333 | 120.5333333 | 111 | 37864 |
| Lugipe | city | Province of Ilocos Sur | Philippines | 16.95 | 120.4666667 | 275 | 35683 |
| Luna | city | Province of Ilocos Sur | Philippines | 17.3163889 | 120.5122222 | 42 | 25605 |
| Lungog | city | Province of Ilocos Sur | Philippines | 17.4644444 | 120.4769444 | 85 | 36286 |
| Lungon | city | Province of Ilocos Sur | Philippines | 17.05 | 120.6 | 2864 | 5493 |
| Lupac | city | Province of Ilocos Sur | Philippines | 17.2280556 | 120.57 | 541 | 13841 |
| Lupes | city | Province of Ilocos Sur | Philippines | 17.2333333 | 120.4833333 | 85 | 40323 |
| Lussoc | city | Province of Ilocos Sur | Philippines | 17.65 | 120.4333333 | 19 | 54751 |
| Luyo | city | Province of Ilocos Sur | Philippines | 16.7833333 | 120.55 | 656 | 9417 |
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