UpAlphabetical listing of Places in Piaui
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Miguel Alves | city | Piaui | Brazil | -4.17 | -42.90 | 160 | 23766 |
| Miguel Leão | city | Piaui | Brazil | -5.68 | -42.73 | 830 | 2344 |
| Milagres | city | Piaui | Brazil | -3.79 | -42.29 | 387 | 2384 |
| Mimosa | city | Piaui | Brazil | -5.07 | -42.13 | 830 | 869 |
| Mimosa | city | Piaui | Brazil | -5.98 | -42.15 | 830 | 842 |
| Mimoso | city | Piaui | Brazil | -3.55 | -42.02 | 190 | 620 |
| Mimosos | city | Piaui | Brazil | -4.12 | -42.47 | 331 | 596 |
| Mina | city | Piaui | Brazil | -7.07 | -41.82 | 1003 | 861 |
| Minador | city | Piaui | Brazil | -5.65 | -42.48 | 830 | 596 |
| Minador | city | Piaui | Brazil | -7.90 | -41.78 | 1046 | 59 |
| Minador de Baixo | city | Piaui | Brazil | -3.30 | -42.01 | 19 | 1605 |
| Minador de Cima | city | Piaui | Brazil | -3.32 | -42.01 | 32 | 1599 |
| Minadouro | city | Piaui | Brazil | -3.78 | -42.28 | 403 | 2384 |
| Mirador | city | Piaui | Brazil | -8.03 | -45.22 | 1669 | 149 |
| Miradouro | city | Piaui | Brazil | -4.93 | -42.32 | 830 | 1043 |
| Miraima II | city | Piaui | Brazil | -5.12 | -41.40 | 915 | 149 |
| Miranda Dantas | city | Piaui | Brazil | -5.06 | -42.78 | 328 | 203602 |
| Mirante | city | Piaui | Brazil | -3.81 | -42.30 | 360 | 2384 |
| Mirante dos Morros | city | Piaui | Brazil | -5.03 | -42.77 | 360 | 194913 |
| Mirindiba | city | Piaui | Brazil | -6.53 | -42.08 | 921 | 1536 |
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