| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Nacugang | city | Province of Ilocos Sur | Philippines | 16.95 | 120.55 | 1056 | 12633 |
| Nagbalioartian | city | Province of Ilocos Sur | Philippines | 17.8666667 | 120.4833333 | 141 | 37427 |
| Nagbettedan | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.45 | 72 | 72043 |
| Nagbokel | city | Province of Ilocos Sur | Philippines | 17.6666667 | 120.4666667 | 456 | 47352 |
| Nagbukel | city | Province of Ilocos Sur | Philippines | 17.6666667 | 120.4666667 | 456 | 47352 |
| Nagbukel | city | Province of Ilocos Sur | Philippines | 17.445 | 120.5283333 | 160 | 45796 |
| Nagbuquel | city | Province of Ilocos Sur | Philippines | 17.445 | 120.5283333 | 160 | 45796 |
| Nagguiddayan | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.4666667 | 984 | 39781 |
| Naglaoaan | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.3833333 | 26 | 44749 |
| Nagpanaoan | city | Province of Ilocos Sur | Philippines | 17.1 | 120.4666667 | 147 | 48637 |
| Nagrebcan | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.45 | 45 | 35098 |
| Nagsabaran | city | Province of Ilocos Sur | Philippines | 17.7166667 | 120.4666667 | 124 | 52649 |
| Nagsangalan | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.4 | 16 | 92225 |
| Nagsangalan Bisset | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.4 | 16 | 92225 |
| Nagsantaan | city | Province of Ilocos Sur | Philippines | 17.8166667 | 120.4875 | 183 | 42855 |
| Nagsingcaoan | city | Province of Ilocos Sur | Philippines | 17.7769444 | 120.4872222 | 127 | 50916 |
| Nagsupotan | city | Province of Ilocos Sur | Philippines | 17.7352778 | 120.4730556 | 164 | 52649 |
| Nagsuputan | city | Province of Ilocos Sur | Philippines | 17.7352778 | 120.4730556 | 164 | 52649 |
| Nagtablaan | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.5 | 52 | 38398 |
| Nagtapacan | city | Province of Ilocos Sur | Philippines | 17.5166667 | 120.4166667 | 0 | 58129 |
| Nagtenga | city | Province of Ilocos Sur | Philippines | 17.05 | 120.4666667 | 114 | 38465 |
| Nagtengga | city | Province of Ilocos Sur | Philippines | 17.05 | 120.4666667 | 114 | 38465 |
| Nagteñga | city | Province of Ilocos Sur | Philippines | 17.05 | 120.4666667 | 114 | 38465 |
| Nagtupacan | city | Province of Ilocos Sur | Philippines | 17.3833333 | 120.4666667 | 39 | 47927 |
| Nagtupocan | city | Province of Ilocos Sur | Philippines | 17.3833333 | 120.4666667 | 39 | 47927 |
| Naguilian | city | Province of Ilocos Sur | Philippines | 17.55 | 120.4 | 16 | 92225 |
| Naguimba | city | Province of Ilocos Sur | Philippines | 17.2666667 | 120.5 | 246 | 23346 |
| Nagungboran | city | Province of Ilocos Sur | Philippines | 17.8613889 | 120.5058333 | 275 | 31190 |
| Nagungburan | city | Province of Ilocos Sur | Philippines | 17.8613889 | 120.5058333 | 275 | 31190 |
| Nagyebngan | city | Province of Ilocos Sur | Philippines | 17.7833333 | 120.4833333 | 118 | 50916 |
| Naiba | city | Province of Ilocos Sur | Philippines | 16.9666667 | 120.65 | 4593 | 5630 |
| Nalasin | city | Province of Ilocos Sur | Philippines | 17.6 | 120.3833333 | 16 | 82684 |
| Nalasin | city | Province of Ilocos Sur | Philippines | 17.2833333 | 120.45 | 114 | 31043 |
| Nalasin | city | Province of Ilocos Sur | Philippines | 17.2536111 | 120.5211111 | 246 | 23346 |
| Nalidaoan | city | Province of Ilocos Sur | Philippines | 16.95 | 120.65 | 4921 | 6219 |
| Nalideg | city | Province of Ilocos Sur | Philippines | 17.1586111 | 120.68 | 1259 | 3669 |
| Nalvo | city | Province of Ilocos Sur | Philippines | 17.3666667 | 120.45 | 0 | 23885 |
| Namalangan | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.4333333 | 127 | 32500 |
| Namatican | city | Province of Ilocos Sur | Philippines | 17.1188889 | 120.4833333 | 62 | 48637 |
| Namatingan | city | Province of Ilocos Sur | Philippines | 17 | 120.5666667 | 921 | 9461 |
| Nambaran | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.3833333 | 16 | 82684 |
| Nambaran | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.4333333 | 72 | 54751 |
| Namitpit | city | Province of Ilocos Sur | Philippines | 17.1091667 | 120.7 | 1213 | 3758 |
| Namitput | city | Province of Ilocos Sur | Philippines | 17.1091667 | 120.7 | 1213 | 3758 |
| Nanangduan | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.5666667 | 1007 | 15316 |
| Nanerman | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.3666667 | 19 | 24820 |
| Nangalisan | city | Province of Ilocos Sur | Philippines | 17.1 | 120.4333333 | 16 | 35098 |
| Nanguneg | city | Province of Ilocos Sur | Philippines | 17.4 | 120.4666667 | 36 | 47927 |
| Nansuagao | city | Province of Ilocos Sur | Philippines | 17.55 | 120.4 | 16 | 92225 |
| Napayeo | city | Province of Ilocos Sur | Philippines | 16.95 | 120.6666667 | 5620 | 6856 |
| Napid | city | Province of Ilocos Sur | Philippines | 17.8166667 | 120.5 | 219 | 24653 |
| Napo | city | Province of Ilocos Sur | Philippines | 17.6666667 | 120.4333333 | 82 | 46641 |
| Napo | city | Province of Ilocos Sur | Philippines | 17.95 | 120.5 | 85 | 31568 |
| Narognoy | city | Province of Ilocos Sur | Philippines | 17.4333333 | 120.4833333 | 82 | 47768 |
| Narvacan | city | Province of Ilocos Sur | Philippines | 17.4216667 | 120.4761111 | 82 | 47768 |
| Nasuko | city | Province of Ilocos Sur | Philippines | 17.0952778 | 120.6744444 | 1499 | 3758 |
| Nayapyap | city | Province of Ilocos Sur | Philippines | 16.9 | 120.6666667 | 6315 | 7688 |
| Nueva Coveta | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.4833333 | 226 | 32306 |
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