Most populated municipalities

The 20 municipalities in Piauí with the most residents, and the 20 with the fewest, out of 221 with a published figure.

	Municipality	State	Postal code	Residents
1	Teresina	Piauí	64000-000	866,300
2	Parnaíba	Piauí	64200-000	162,159
3	Picos	Piauí	64600-000	83,090
4	Piripiri	Piauí	64260-000	65,538
5	Floriano	Piauí	64800-000	62,036
6	Barras	Piauí	64100-000	47,938
7	Altos	Piauí	64290-000	47,453
8	União	Piauí	64120-000	46,119
9	Campo Maior	Piauí	64280-000	45,793
10	José de Freitas	Piauí	64110-000	42,559
11	Esperantina	Piauí	64180-000	40,970
12	São Raimundo Nonato	Piauí	64770-000	38,934
13	Oeiras	Piauí	64500-000	38,161
14	Pedro II	Piauí	64255-000	37,894
15	Miguel Alves	Piauí	64130-000	32,150
16	Luís Correia	Piauí	64220-000	30,641
17	Piracuruca	Piauí	64240-000	28,846
18	Bom Jesus	Piauí	64900-000	28,796
19	Cocal	Piauí	64235-000	28,212
20	Corrente	Piauí	64980-000	27,278

Least populated municipalities

	Municipality	State	Postal code	Residents
1	Miguel Leão	Piauí	64445-000	1,318
2	Santo Antônio dos Milagres	Piauí	64438-000	2,138
3	São Miguel da Baixa Grande	Piauí	64378-000	2,269
4	São Luis do Piauí	Piauí	64638-000	2,309
5	Tanque do Piauí	Piauí	64512-000	2,316
6	Floresta do Piauí	Piauí	64563-000	2,333
7	Porto Alegre do Piauí	Piauí	64858-000	2,364
8	Pedro Laurentino	Piauí	64728-000	2,458
9	Olho D'Água do Piauí	Piauí	64468-000	2,637
10	Novo Santo Antônio	Piauí	64365-000	2,827
11	São Miguel do Fidalgo	Piauí	64558-000	2,829
12	São Félix do Piauí	Piauí	64375-000	2,842
13	Francisco Macedo	Piauí	64683-000	2,929
14	Vila Nova do Piauí	Piauí	64688-000	2,935
15	Lagoinha do Piauí	Piauí	64465-000	2,939
16	São Gonçalo do Gurguéia	Piauí	64993-000	2,947
17	Tamboril do Piauí	Piauí	64893-000	2,949
18	João Costa	Piauí	64765-000	2,970
19	Pajeú do Piauí	Piauí	64898-000	3,000
20	Prata do Piauí	Piauí	64370-000	3,042

Most populated municipalities — All of Brazil

One row per municipalities. The figures are published by municipality, so every postal code inside one shares them; the postal code shown is one of that municipality's.