225 cities and towns
| Abbreviation | 20 |
| State Population | 3,193,333 |
| # | City | Population | Median Income | Home Value | Median Rent | Median Age |
|---|---|---|---|---|---|---|
| 1 | Teresina | 871,126 | N/A | N/A | N/A | 34.3 |
| 2 | Parnaíba | 138,008 | N/A | N/A | N/A | 34.3 |
| 3 | Picos | 83,090 | N/A | N/A | N/A | 34.3 |
| 4 | Piripiri | 65,538 | N/A | N/A | N/A | 34.3 |
| 5 | Floriano | 62,036 | N/A | N/A | N/A | 34.3 |
| 6 | Barras | 47,938 | N/A | N/A | N/A | 34.3 |
| 7 | Altos | 47,453 | N/A | N/A | N/A | 34.3 |
| 8 | União | 46,119 | N/A | N/A | N/A | 34.3 |
| 9 | Campo Maior | 45,793 | N/A | N/A | N/A | 34.3 |
| 10 | José de Freitas | 42,559 | N/A | N/A | N/A | 34.3 |
| 11 | Esperantina | 40,970 | N/A | N/A | N/A | 34.3 |
| 12 | São Raimundo Nonato | 38,934 | N/A | N/A | N/A | 34.3 |
| 13 | Oeiras | 38,161 | N/A | N/A | N/A | 34.3 |
| 14 | Pedro II | 37,894 | N/A | N/A | N/A | 34.3 |
| 15 | Miguel Alves | 32,150 | N/A | N/A | N/A | 34.3 |
| 16 | Luís Correia | 30,641 | N/A | N/A | N/A | 34.3 |
| 17 | Piracuruca | 28,846 | N/A | N/A | N/A | 34.3 |
| 18 | Bom Jesus | 28,796 | N/A | N/A | N/A | 34.3 |
| 19 | Cocal | 28,212 | N/A | N/A | N/A | 34.3 |
| 20 | Corrente | 27,278 | N/A | N/A | N/A | 34.3 |
| 21 | Batalha | 26,300 | N/A | N/A | N/A | 34.3 |
| 22 | Luzilândia | 25,375 | N/A | N/A | N/A | 34.3 |
| 23 | Uruçuí | 25,203 | N/A | N/A | N/A | 34.3 |
| 24 | Valença do Piauí | 22,279 | N/A | N/A | N/A | 34.3 |
| 25 | São João do Piauí | 21,421 | N/A | N/A | N/A | 34.3 |
| 26 | Paulistana | 21,055 | N/A | N/A | N/A | 34.3 |
| 27 | Buriti dos Lopes | 19,654 | N/A | N/A | N/A | 34.3 |
| 28 | Canto do Buriti | 19,365 | N/A | N/A | N/A | 34.3 |
| 29 | Castelo do Piauí | 19,288 | N/A | N/A | N/A | 34.3 |
| 30 | Pio IX | 17,613 | N/A | N/A | N/A | 34.3 |
| 31 | Água Branca | 17,573 | N/A | N/A | N/A | 34.3 |
| 32 | São Miguel do Tapuio | 17,554 | N/A | N/A | N/A | 34.3 |
| 33 | Jaicós | 17,527 | N/A | N/A | N/A | 34.3 |
| 34 | Amarante | 17,234 | N/A | N/A | N/A | 34.3 |
| 35 | Regeneração | 17,133 | N/A | N/A | N/A | 34.3 |
| 36 | Ipueiras | 17,111 | N/A | N/A | N/A | 34.3 |
| 37 | Demerval Lobão | 16,352 | N/A | N/A | N/A | 34.3 |
| 38 | Inhuma | 14,958 | N/A | N/A | N/A | 34.3 |
| 39 | Simões | 14,350 | N/A | N/A | N/A | 34.3 |
| 40 | Joaquim Pires | 13,886 | N/A | N/A | N/A | 34.3 |
| 41 | Simplício Mendes | 13,870 | N/A | N/A | N/A | 34.3 |
| 42 | São Pedro do Piauí | 13,755 | N/A | N/A | N/A | 34.3 |
| 43 | Elesbão Veloso | 13,607 | N/A | N/A | N/A | 34.3 |
| 44 | Alto Longá | 13,479 | N/A | N/A | N/A | 34.3 |
| 45 | Baixa Grande do Ribeiro | 13,272 | N/A | N/A | N/A | 34.3 |
| 46 | Palmeirais | 13,264 | N/A | N/A | N/A | 34.3 |
| 47 | Porto | 12,052 | N/A | N/A | N/A | 34.3 |
| 48 | Pimenteiras | 11,341 | N/A | N/A | N/A | 34.3 |
| 49 | Curimatá | 11,270 | N/A | N/A | N/A | 34.3 |
| 50 | Gilbués | 11,166 | N/A | N/A | N/A | 34.3 |