UpAlphabetical listing of Places in Ilocos Sur
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Ma-opong | city | Ilocos Sur | Philippines | 17.03 | 120.76 | 1968 | 3661 |
| Maas-Asin | city | Ilocos Sur | Philippines | 17.69 | 120.47 | 278 | 48217 |
| Maasasin | city | Ilocos Sur | Philippines | 17.69 | 120.47 | 278 | 48217 |
| Mabatano | city | Ilocos Sur | Philippines | 17.20 | 120.62 | 1669 | 5072 |
| Mabatano | city | Ilocos Sur | Philippines | 17.14 | 120.62 | 1738 | 4629 |
| Mabec | city | Ilocos Sur | Philippines | 16.99 | 120.70 | 1669 | 5487 |
| Mabecbecan | city | Ilocos Sur | Philippines | 16.99 | 120.70 | 1669 | 5487 |
| Mabilbila | city | Ilocos Sur | Philippines | 17.51 | 120.44 | 160 | 40068 |
| Mabilbila | city | Ilocos Sur | Philippines | 17.51 | 120.44 | 160 | 37848 |
| Mabilbila Norte | city | Ilocos Sur | Philippines | 17.51 | 120.44 | 160 | 40068 |
| Mabilbila Sur | city | Ilocos Sur | Philippines | 17.51 | 120.44 | 160 | 37848 |
| Macaoayan | city | Ilocos Sur | Philippines | 17.33 | 120.50 | 45 | 33540 |
| Macatcatad | city | Ilocos Sur | Philippines | 17.70 | 120.48 | 255 | 48811 |
| Macawayan | city | Ilocos Sur | Philippines | 17.33 | 120.50 | 45 | 33540 |
| Madarang | city | Ilocos Sur | Philippines | 17.15 | 120.55 | 265 | 18939 |
| Madayao | city | Ilocos Sur | Philippines | 17.08 | 120.62 | 2509 | 3877 |
| Magno | city | Ilocos Sur | Philippines | 17.50 | 120.40 | 0 | 45715 |
| Magsingal | city | Ilocos Sur | Philippines | 17.68 | 120.43 | 75 | 39419 |
| Magun | city | Ilocos Sur | Philippines | 16.98 | 120.68 | 2624 | 5539 |
| Magur | city | Ilocos Sur | Philippines | 16.98 | 120.68 | 2624 | 5539 |
| Mainganay | city | Ilocos Sur | Philippines | 17.38 | 120.48 | 52 | 43946 |
| Mainganay Norte | city | Ilocos Sur | Philippines | 17.39 | 120.50 | 62 | 48903 |
| Mainganay Sur | city | Ilocos Sur | Philippines | 17.38 | 120.48 | 52 | 43946 |
| Malammin | city | Ilocos Sur | Philippines | 17.75 | 120.47 | 187 | 54248 |
| Malammin Sur | city | Ilocos Sur | Philippines | 17.75 | 120.47 | 187 | 54248 |
| Malamsit | city | Ilocos Sur | Philippines | 17.44 | 120.53 | 203 | 38951 |
| Malaya | city | Ilocos Sur | Philippines | 16.94 | 120.69 | 5180 | 6201 |
| Malaya | city | Ilocos Sur | Philippines | 16.98 | 120.71 | 1669 | 5814 |
| Malideg | city | Ilocos Sur | Philippines | 17.16 | 120.68 | 1669 | 3488 |
| Malingeb | city | Ilocos Sur | Philippines | 17.60 | 120.43 | 16 | 72950 |
| Mamarsang | city | Ilocos Sur | Philippines | 16.91 | 120.57 | 1669 | 8533 |
| Mambog | city | Ilocos Sur | Philippines | 17.05 | 120.45 | 45 | 30398 |
| Mambog | city | Ilocos Sur | Philippines | 17.30 | 120.45 | 65 | 26122 |
| Mambog | city | Ilocos Sur | Philippines | 17.35 | 120.49 | 101 | 41860 |
| Mambug | city | Ilocos Sur | Philippines | 17.35 | 120.49 | 101 | 41860 |
| Mambug | city | Ilocos Sur | Philippines | 17.30 | 120.45 | 65 | 26122 |
| Mambug Norte | city | Ilocos Sur | Philippines | 17.35 | 120.48 | 101 | 40058 |
| Mambug Sur | city | Ilocos Sur | Philippines | 17.35 | 120.49 | 101 | 41860 |
| Manabac | city | Ilocos Sur | Philippines | 17.33 | 120.52 | 328 | 29414 |
| Manaboc | city | Ilocos Sur | Philippines | 17.33 | 120.52 | 328 | 29414 |
| Manabuc | city | Ilocos Sur | Philippines | 17.33 | 120.52 | 328 | 29414 |
| Manangat | city | Ilocos Sur | Philippines | 17.54 | 120.37 | 16 | 61611 |
| Mananget | city | Ilocos Sur | Philippines | 17.54 | 120.37 | 16 | 61611 |
| Manatong | city | Ilocos Sur | Philippines | 16.95 | 120.62 | 1938 | 5422 |
| Manayon | city | Ilocos Sur | Philippines | 17.16 | 120.44 | 78 | 39989 |
| Manga | city | Ilocos Sur | Philippines | 17.20 | 120.55 | 984 | 15093 |
| Mantanas | city | Ilocos Sur | Philippines | 17.04 | 120.45 | 29 | 22967 |
| Manueva | city | Ilocos Sur | Philippines | 17.52 | 120.44 | 160 | 46297 |
| Manzante | city | Ilocos Sur | Philippines | 17.69 | 120.40 | 29 | 28814 |
| Mapacac | city | Ilocos Sur | Philippines | 16.97 | 120.67 | 4189 | 5551 |
| Mapalina | city | Ilocos Sur | Philippines | 17.02 | 120.55 | 1906 | 8976 |
| Mapan | city | Ilocos Sur | Philippines | 17.73 | 120.47 | 111 | 52012 |
| Mapanit | city | Ilocos Sur | Philippines | 17.30 | 120.53 | 328 | 17307 |
| Maradudon | city | Ilocos Sur | Philippines | 17.80 | 120.48 | 82 | 43814 |
| Maratudo | city | Ilocos Sur | Philippines | 17.68 | 120.49 | 830 | 43025 |
| Margaay | city | Ilocos Sur | Philippines | 17.43 | 120.47 | 82 | 45357 |
| Margaay | city | Ilocos Sur | Philippines | 17.44 | 120.47 | 82 | 43370 |
| Margay | city | Ilocos Sur | Philippines | 17.81 | 120.45 | 39 | 43980 |
| Marmarsang | city | Ilocos Sur | Philippines | 16.93 | 120.57 | 2726 | 8789 |
| Marnay | city | Ilocos Sur | Philippines | 17.88 | 120.50 | 229 | 38944 |
| Marong | city | Ilocos Sur | Philippines | 17.90 | 120.46 | 124 | 24926 |
| Marozo | city | Ilocos Sur | Philippines | 17.46 | 120.53 | 164 | 31324 |
| Maruya Este | city | Ilocos Sur | Philippines | 17.74 | 120.49 | 377 | 47856 |
| Maruya Oeste | city | Ilocos Sur | Philippines | 17.74 | 120.47 | 111 | 52319 |
| Masadag | city | Ilocos Sur | Philippines | 17.86 | 120.49 | 187 | 35224 |
| Masingal | city | Ilocos Sur | Philippines | 17.68 | 120.43 | 75 | 39419 |
| Masiosioay | city | Ilocos Sur | Philippines | 17.25 | 120.63 | 1669 | 5084 |
| Maspiil | city | Ilocos Sur | Philippines | 17.02 | 120.73 | 1669 | 4478 |
| Matanobong | city | Ilocos Sur | Philippines | 17.20 | 120.45 | 39 | 46617 |
| Matanobong | city | Ilocos Sur | Philippines | 17.30 | 120.43 | 164 | 20990 |
| Matanubong | city | Ilocos Sur | Philippines | 17.20 | 120.45 | 39 | 46617 |
| Matbo | city | Ilocos Sur | Philippines | 17.12 | 120.62 | 1794 | 4300 |
| Matibuay | city | Ilocos Sur | Philippines | 17.22 | 120.68 | 1669 | 4124 |
| Matibuei | city | Ilocos Sur | Philippines | 17.22 | 120.68 | 1669 | 4124 |
| Matibuey | city | Ilocos Sur | Philippines | 17.22 | 120.68 | 1669 | 4124 |
| Matocbo | city | Ilocos Sur | Philippines | 16.95 | 120.67 | 5869 | 5958 |
| Matue | city | Ilocos Sur | Philippines | 17.13 | 120.60 | 830 | 5404 |
| Maupong | city | Ilocos Sur | Philippines | 17.02 | 120.73 | 1669 | 4478 |
| Maynganay Norte | city | Ilocos Sur | Philippines | 17.39 | 120.50 | 62 | 48903 |
| Maynganay Sur | city | Ilocos Sur | Philippines | 17.38 | 120.48 | 52 | 43946 |
| McKinley | city | Ilocos Sur | Philippines | 17.21 | 120.49 | 164 | 38209 |
| Mindoro | city | Ilocos Sur | Philippines | 17.56 | 120.35 | 16 | 51080 |
| Mira | city | Ilocos Sur | Philippines | 17.60 | 120.41 | 16 | 81549 |
| Miramar | city | Ilocos Sur | Philippines | 17.71 | 120.41 | 29 | 31901 |
| Mision | city | Ilocos Sur | Philippines | 17.43 | 120.52 | 124 | 45219 |
| Mission | city | Ilocos Sur | Philippines | 17.43 | 120.52 | 124 | 45219 |
| Montero | city | Ilocos Sur | Philippines | 17.23 | 120.48 | 85 | 37309 |
| Morozo | city | Ilocos Sur | Philippines | 17.46 | 120.53 | 164 | 31324 |
| Muraya | city | Ilocos Sur | Philippines | 17.74 | 120.47 | 111 | 52319 |
| Muruya | city | Ilocos Sur | Philippines | 17.74 | 120.47 | 111 | 52319 |
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