| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Madefalva | city | Harghita | Romania | 46.42 | 25.75 | 2509 | 10003 |
| Magherus | city | Harghita | Romania | 46.93 | 25.35 | 2509 | 12407 |
| Magyarandrásfalva | city | Harghita | Romania | 46.35 | 25.02 | 1669 | 3386 |
| Magyarigen | city | Harghita | Romania | 46.20 | 25.28 | 1811 | 2044 |
| Magyaros | city | Harghita | Romania | 46.93 | 25.35 | 2509 | 12407 |
| Marefalva | city | Harghita | Romania | 46.33 | 25.37 | 2063 | 25485 |
| Maros | city | Harghita | Romania | 46.62 | 25.72 | 3349 | 2747 |
| Marosfalva | city | Harghita | Romania | 46.65 | 25.55 | 2509 | 8325 |
| Marosfő | city | Harghita | Romania | 46.62 | 25.72 | 3349 | 2747 |
| Maroshèviz | city | Harghita | Romania | 46.92 | 25.33 | 2509 | 10430 |
| Marostizloa | city | Harghita | Romania | 46.65 | 25.55 | 2509 | 8325 |
| Martonca | city | Harghita | Romania | 46.78 | 25.45 | 2509 | 4720 |
| Matisfalva | city | Harghita | Romania | 46.23 | 25.17 | 1942 | 4875 |
| Medişor | city | Harghita | Romania | 46.37 | 25.07 | 1669 | 2432 |
| Medişoru Mare | city | Harghita | Romania | 46.37 | 25.07 | 1669 | 2432 |
| Medişoru Mic | city | Harghita | Romania | 46.38 | 25.05 | 2070 | 2365 |
| Menasag | city | Harghita | Romania | 46.35 | 25.97 | 2752 | 2365 |
| Menasag Pottyond | city | Harghita | Romania | 46.35 | 25.95 | 2821 | 2644 |
| Menasag-Ujfalu | city | Harghita | Romania | 46.33 | 25.97 | 2778 | 2022 |
| Mercurea Ciuc | city | Harghita | Romania | 46.35 | 25.80 | 2509 | 33465 |
| Mereşti | city | Harghita | Romania | 46.23 | 25.45 | 1942 | 1825 |
| Miercurea Ciuc | city | Harghita | Romania | 46.35 | 25.80 | 2509 | 33465 |
| Miercurea Ciuc / Csíkszereda | city | Harghita | Romania | 46.35 | 25.80 | 2509 | 33465 |
| Miercurea-Ciuc | city | Harghita | Romania | 46.35 | 25.80 | 2509 | 33465 |
| Miercurea-Ciucului | city | Harghita | Romania | 46.35 | 25.80 | 2509 | 33465 |
| Mierkuria-Čukas | city | Harghita | Romania | 46.35 | 25.80 | 2509 | 33465 |
| Mihaileni | city | Harghita | Romania | 46.47 | 25.82 | 2509 | 2802 |
| Mihăileni | city | Harghita | Romania | 46.37 | 25.18 | 1774 | 2832 |
| Miklósfalva | city | Harghita | Romania | 46.23 | 25.25 | 1925 | 6989 |
| Mindszent | city | Harghita | Romania | 46.32 | 25.90 | 2618 | 2976 |
| Minele Lueta | city | Harghita | Romania | 46.35 | 25.52 | 2713 | 4242 |
| Minele Lueta | city | Harghita | Romania | 46.27 | 25.48 | 2080 | 2261 |
| Minereni | city | Harghita | Romania | 46.27 | 25.48 | 2080 | 2261 |
| Misentea | city | Harghita | Romania | 46.32 | 25.90 | 2618 | 2976 |
| Moglan | city | Harghita | Romania | 46.92 | 25.38 | 2509 | 13062 |
| Moglanesti | city | Harghita | Romania | 46.92 | 25.38 | 2509 | 13062 |
| Morăreni | city | Harghita | Romania | 46.35 | 25.22 | 1948 | 3217 |
| Mugeni | city | Harghita | Romania | 46.25 | 25.22 | 1669 | 7331 |
| Mujna | city | Harghita | Romania | 46.20 | 25.15 | 1669 | 2114 |
| Mureş-Sat | city | Harghita | Romania | 46.65 | 25.55 | 2509 | 8325 |
| Muzsna | city | Harghita | Romania | 46.20 | 25.15 | 1669 | 2114 |
| Màrtonka | city | Harghita | Romania | 46.78 | 25.45 | 2509 | 4720 |
| Mădăraş | city | Harghita | Romania | 46.50 | 25.75 | 2509 | 6513 |
| Mărtiniş | city | Harghita | Romania | 46.23 | 25.38 | 1669 | 2189 |
| Mătişeni | city | Harghita | Romania | 46.23 | 25.17 | 1942 | 4875 |