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The Global Risks Index

NXS-GRX-BRA · South America · Regions

Piaui

First-level unit, Brazil: people, area, the units inside and neighbours, with risk values when released.

Map All 27 first-level units
Page GRX-BRA-REdition Baseline Edition 2026Evidence close 2026-09-30ISO BRA / BRStatus UN member stateValues not yet publishedMethod v1.0.0-draft
3,583,321
people (GHSL 2025)
252,827 km²
area
1.7%
of Brazil
221
units inside

01Ramani

Inside Piaui

The 221 ADM2 units of Piaui.

FIG 1 · 221 units inside Piaui
Loading the map

Units rise with people per km² · GHSL 2025 raster · terrain · ADM1 ADM2Risk values when released
Lowest fifthLow fifthMiddle fifthHigh fifthHighest fifthNo data
Column height and colour show people per km² by unit, in quantile fifths among the units shown (the key on the map gives the breaks); units with no people on the grid are grey, not the lowest class; the raster beneath is the GHSL 2025 population grid. Source observations, not index values. Choose a humanitarian figure from the list to colour and raise the units by it; each figure shows its source on the unit page. Select a unit to drill into the units inside it; the path above the map climbs back.
02Figures

People, area and density

Source observations from open grids summed inside the boundary; not index values.

Watu · GHSL 2025

3,583,321

1.7% of Brazil.

Watu · WorldPop 2025

3,492,994

-3% against GHSL; the two grids differ in method.

Area

252,827 km²

14 people per km².

Code

BR-PI

Subdivision code as carried by the boundary source.

Ukanda wa pwani ulio chini

71,635

people on land at or below 10 m, 2.0% of the unit (GEBCO 2024 and GHSL 2025).

03Humanitarian data

Piaui in humanitarian data

Source observations from the Humanitarian Data Exchange, matched to this unit by name, each with its reference date, provider and licence. They are not index values.

Population · 2022-12-31

3,271,199

people. UNFPA · Creative Commons Attribution for Intergovernmental Organisations (CC BY-IGO).

Poverty headcount · 2015-12-31

9%

of people in multidimensional poverty. Oxford Poverty & Human Development Initiative · Public Domain / No restrictions (CC0).

04Units

221 units inside Piaui

Each unit has its own page.

Boundary licences: Creative Commons Attribution 2.5 Generic · Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO)

Unit Code People (GHSL) People (WorldPop) Area km² Per km² Share Coast ≤ 10 m
Acauã – 7,969 6,596 1,284.39 6 0.2% 0
Agricolândia – 5,004 4,731 112.6 44 0.1% 0
Água Branca – 17,478 18,409 97.67 179 0.5% 0
Alagoinha do Piauí – 8,498 7,118 538.27 16 0.2% 0
Alegrete do Piauí – 4,796 4,341 244.59 20 0.1% 0
Alto Longá – 14,954 13,639 1,745.2 9 0.4% 0
Altos – 44,765 50,125 962.25 47 1.3% 0
Alvorada do Gurguéia – 5,747 5,655 2,142.42 3 0.2% 0
Amarante – 22,509 20,951 1,160.52 19 0.7% 0
Angical do Piauí – 7,445 7,690 224.26 33 0.2% 0
Anísio de Abreu – 10,226 10,033 339.64 30 0.3% 0
Antônio Almeida – 3,245 3,293 648.95 5 0.1% 0
Aroazes – 6,228 5,316 825.65 8 0.2% 0
Aroeiras do Itaim – 2,854 2,691 318.23 9 0.1% 0
Arraial – 4,863 4,657 687.06 7 0.1% 0
Assunção do Piauí – 8,032 7,774 1,696.52 5 0.2% 0
Avelino Lopes – 11,910 11,217 1,223.07 10 0.3% 0
Baixa Grande do Ribeiro – 11,780 13,981 7,842.06 2 0.3% 0
Barra D’Alcântara – 3,532 3,961 263.72 13 0.1% 0
Barras – 49,715 51,031 1,729.75 29 1.4% 0
Barreiras do Piauí – 3,392 3,389 2,177.63 2 0.1% 0
Barro Duro – 7,241 6,658 160.28 45 0.2% 0
Batalha – 33,421 33,271 1,595.83 21 1% 0
Bela Vista do Piauí – 4,209 4,198 501.32 8 0.1% 0
Belém do Piauí – 3,029 2,995 244.4 12 0.1% 0
Beneditinos – 10,581 10,427 939.34 11 0.3% 0
Bertolínia – 5,846 6,074 1,229.85 5 0.2% 0
Betânia do Piauí – 5,066 5,592 583.26 9 0.1% 0
Boa Hora – 6,434 6,976 338.37 19 0.2% 0
Bocaina – 4,656 3,969 261.84 18 0.1% 0
Bom Jesus – 27,181 31,694 5,494.34 5 0.8% 0
Bom Princípio do Piauí – 6,268 6,192 525.09 12 0.2% 0
Bonfim do Piauí – 5,450 5,883 289.91 19 0.2% 0
Boqueirão do Piauí – 7,168 7,412 271.15 26 0.2% 0
Brasileira – 8,377 8,658 885.87 9 0.2% 0
Brejo do Piauí – 4,297 3,910 2,275.86 2 0.1% 0
Buriti dos Lopes – 19,215 20,474 693.06 28 0.6% 4,410
Buriti dos Montes – 8,783 7,822 2,448.03 4 0.3% 0
Cabeceiras do Piauí – 11,892 11,551 612.01 19 0.3% 0
Cajazeiras do Piauí – 3,803 3,072 515.85 7 0.1% 0
Caldeirão Grande do Piauí – 6,037 5,613 469.04 13 0.2% 0
Campinas do Piauí – 5,241 4,368 787.42 7 0.2% 0
Campo Alegre do Fidalgo – 4,897 4,610 660.43 7 0.1% 0
Campo Grande do Piauí – 6,558 6,331 313.95 21 0.2% 0
Campo Largo do Piauí – 6,379 6,633 479.3 13 0.2% 0
Campo Maior – 46,646 47,610 1,687.02 28 1.4% 0
Canavieira – 4,018 3,256 2,170.53 2 0.1% 0
Canto do Buriti – 21,672 19,577 4,344.26 5 0.6% 0
Capitão de Campos – 12,860 12,173 572.28 22 0.4% 0
Capitão Gervásio Oliveira – 4,163 4,031 1,138.28 4 0.1% 0
Caracol – 12,661 11,772 1,617.52 8 0.4% 0
Caraúbas do Piauí – 5,762 5,718 472.38 12 0.2% 12
Caridade do Piauí – 5,323 5,221 500.31 11 0.2% 0
Castelo do Piauí – 19,999 19,941 2,388.85 8 0.6% 0
Caxingó – 5,904 6,013 494.22 12 0.2% 677
Cocal – 28,299 29,013 1,300.41 22 0.8% 0
Cocal de Telha – 4,795 4,912 312.08 15 0.1% 0
Cocal dos Alves – 7,407 7,652 326.09 23 0.2% 0
Coivaras – 4,422 4,738 487.49 9 0.1% 0
Colônia do Gurguéia – 6,775 6,295 430.67 16 0.2% 0
Colônia do Piauí – 7,981 6,987 951.58 8 0.2% 0
Conceição do Canindé – 4,836 5,354 827.35 6 0.1% 0
Coronel José Dias – 4,948 4,225 1,924.1 3 0.1% 0
Corrente – 27,775 28,856 3,060.49 9 0.8% 0
Cristalândia do Piauí – 8,869 7,168 1,207.21 7 0.3% 0
Cristino Castro – 11,944 11,553 1,853.88 6 0.3% 0
Curimatá – 11,904 11,940 2,355.04 5 0.3% 0
Currais – 5,406 5,231 3,168.34 2 0.2% 0
Curral Novo do Piauí – 5,978 5,893 758.33 8 0.2% 0
Curralinhos – 4,940 4,672 347.22 14 0.1% 0
Demerval Lobão – 16,073 18,755 217.02 74 0.5% 0
Dirceu Arcoverde – 6,935 7,236 1,021.96 7 0.2% 0
Dom Expedito Lopes – 4,496 4,038 220.04 20 0.1% 0
Dom Inocêncio – 9,771 9,503 3,886.46 3 0.3% 0
Domingos Mourão – 4,910 4,272 852.88 6 0.1% 0
Elesbão Veloso – 15,322 13,653 1,391.32 11 0.4% 0
Eliseu Martins – 5,106 4,290 1,096.1 5 0.1% 0
Esperantina – 36,022 38,208 913.31 39 1% 0
Fartura do Piauí – 6,036 5,963 716.25 8 0.2% 0
Flores do Piauí – 4,605 4,535 950.76 5 0.1% 0
Floresta do Piauí – 1,984 1,944 223.9 9 0.1% 0
Floriano – 70,064 75,355 3,425.34 20 2% 0
Francinópolis – 5,443 4,240 269.12 20 0.2% 0
Francisco Ayres – 4,671 4,638 658.47 7 0.1% 0
Francisco Macedo – 3,626 3,115 177.37 20 0.1% 0
Francisco Santos – 8,485 7,072 494.32 17 0.2% 0
Fronteiras – 11,947 9,702 781 15 0.3% 0
Geminiano – 7,588 8,350 443.65 17 0.2% 0
Gilbués – 14,661 14,668 3,511.61 4 0.4% 0
Guadalupe – 10,606 10,716 1,027.89 10 0.3% 0
Guaribas – 4,424 4,065 3,131.22 1 0.1% 0
Hugo Napoleão – 4,003 3,450 225.65 18 0.1% 0
Inhuma – 15,606 15,634 982.87 16 0.5% 0
Ipiranga do Piauí – 10,144 9,877 531.51 19 0.3% 0
Isaías Coelho – 9,147 7,935 803.97 11 0.3% 0
Itainópolis – 12,494 11,183 831.73 15 0.4% 0
Itaueira – 11,417 10,504 2,565.02 4 0.3% 0
Jacobina do Piauí – 5,873 5,522 1,339.81 4 0.2% 0
Jaicós – 20,374 18,192 867.64 23 0.6% 0
Jardim do Mulato – 4,605 3,959 512.25 9 0.1% 0
Jatobá do Piauí – 5,961 5,110 652.78 9 0.2% 0
Jerumenha – 4,293 4,467 1,875.61 2 0.1% 0
João Costa – 3,079 2,999 1,808.42 2 0.1% 0
Joaquim Pires – 13,825 13,617 743.16 19 0.4% 37
José de Freitas – 44,235 45,503 1,543.88 29 1.3% 0
Juazeiro do Piauí – 5,823 5,590 939.73 6 0.2% 0
Júlio Borges – 5,849 5,495 1,288.5 5 0.2% 0
Jurema – 4,195 3,831 1,277.81 3 0.1% 0
Lagoa Alegre – 8,330 8,122 396.54 21 0.2% 0
Lagoa de São Francisco – 6,484 6,150 156.15 42 0.2% 0
Lagoa do Barro do Piauí – 5,404 5,592 1,336.55 4 0.2% 0
Lagoa do Piauí – 5,212 5,817 429.98 12 0.2% 0
Lagoa do Sítio – 5,908 4,623 807.6 7 0.2% 0
Lagoinha do Piauí – 2,862 3,017 67.77 42 0.1% 0
Landri Sales – 4,995 5,123 1,093.81 5 0.1% 0
Luís Correia – 18,018 17,125 1,078.67 17 0.5% 2,859
Luzilândia – 27,761 27,662 707.72 39 0.8% 0
Madeiro – 6,294 5,428 177.9 35 0.2% 0
Manoel Emídio – 5,314 5,062 1,626.18 3 0.2% 0
Marcolândia – 13,351 12,690 140.32 95 0.4% 0
Marcos Parente – 4,669 4,838 679.79 7 0.1% 0
Massapê do Piauí – 6,429 4,648 533.82 12 0.2% 0
Matias Olímpio – 11,428 11,216 227.68 50 0.3% 0
Miguel Alves – 37,606 36,391 1,398.93 27 1.1% 0
Miguel Leão – 1,376 1,459 93.77 15 0% 0
Milton Brandão – 6,733 6,441 1,315.36 5 0.2% 0
Monsenhor Gil – 10,176 10,313 569.79 18 0.3% 0
Monsenhor Hipólito – 8,198 8,403 402.97 20 0.2% 0
Monte Alegre do Piauí – 7,614 7,886 2,426.38 3 0.2% 0
Morro Cabeça no Tempo – 4,520 4,290 2,218.8 2 0.1% 0
Morro do Chapéu do Piauí – 7,214 7,080 329.7 22 0.2% 0
Murici dos Portelas – 12,738 10,324 481.8 26 0.4% 1,179
Nazaré do Piauí – 7,952 6,719 1,321.01 6 0.2% 0
Nazária – 6,766 8,185 365.8 18 0.2% 0
Nossa Senhora de Nazaré – 3,889 4,151 358.09 11 0.1% 0
Nossa Senhora dos Remédios – 9,230 9,107 358.36 26 0.3% 0
Nova Santa Rita – 4,524 4,147 912.91 5 0.1% 0
Novo Oriente do Piauí – 6,780 6,046 529.4 13 0.2% 0
Novo Santo Antônio – 3,405 2,933 447.6 8 0.1% 0
Oeiras – 39,049 40,957 2,714.66 14 1.1% 0
Olho D’Água do Piauí – 2,289 2,378 183.47 12 0.1% 0
Padre Marcos – 7,289 6,536 280.41 26 0.2% 0
Paes Landim – 4,027 4,110 403.45 10 0.1% 0
Pajeú do Piauí – 3,523 3,068 991.41 4 0.1% 0
Palmeira do Piauí – 5,165 5,218 2,027.13 3 0.1% 0
Palmeirais – 16,499 15,254 1,504.66 11 0.5% 0
Paquetá – 3,727 3,512 433.95 9 0.1% 0
Parnaguá – 11,175 10,010 3,442.78 3 0.3% 0
Parnaíba – 175,353 182,278 439.77 399 5.1% 75,304
Passagem Franca do Piauí – 4,596 4,014 646.08 7 0.1% 0
Patos do Piauí – 6,897 5,508 805.65 9 0.2% 0
Pau D’Arco do Piauí – 4,083 4,046 432.57 9 0.1% 0
Paulistana – 22,308 22,609 1,950.74 11 0.6% 0
Pavussu – 3,778 3,805 1,095.32 3 0.1% 0
Pedro II – 40,083 39,394 1,552.67 26 1.2% 0
Pedro Laurentino – 2,808 2,517 873.88 3 0.1% 0
Picos – 82,876 89,519 579.43 143 2.4% 0
Pimenteiras – 12,915 11,130 4,581.74 3 0.4% 0
Pio IX – 18,165 17,572 1,958.3 9 0.5% 0
Piracuruca – 29,749 29,570 2,379.52 13 0.9% 0
Piripiri – 66,154 69,646 1,413.41 47 1.9% 0
Porto – 4,925 3,787 255.5 19 0.1% 0
Porto Alegre do Piauí – 2,263 1,960 1,174.6 2 0.1% 0
Prata do Piauí – 3,545 3,343 199.2 18 0.1% 0
Queimada Nova – 8,899 8,966 1,289.66 7 0.3% 0
Redenção do Gurguéia – 8,676 8,529 2,478.07 4 0.3% 0
Regeneração – 17,308 16,062 1,256.47 14 0.5% 0
Riacho Frio – 4,620 4,527 2,231.71 2 0.1% 0
Ribeira do Piauí – 5,289 4,442 1,018.09 5 0.2% 0
Ribeiro Gonçalves – 7,685 6,017 3,993.39 2 0.2% 0
Rio Grande do Piauí – 6,732 5,600 638.87 11 0.2% 0
Santa Cruz do Piauí – 6,948 6,327 586.65 12 0.2% 0
Santa Cruz dos Milagres – 3,718 3,066 982.77 4 0.1% 0
Santa Filomena – 19,122 17,217 5,307.57 4 0.6% 0
Santa Luz – 4,821 4,602 1,191.16 4 0.1% 0
Santa Rosa do Piauí – 5,452 4,480 342.36 16 0.2% 0
Santana do Piauí – 4,612 3,869 111.09 42 0.1% 0
Santo Antônio de Lisboa – 6,000 5,496 386.57 16 0.2% 0
Santo Antônio dos Milagres – 2,941 2,886 34.22 86 0.1% 0
Santo Inácio do Piauí – 4,730 4,141 856.17 6 0.1% 0
São Braz do Piauí – 5,821 5,293 658.45 9 0.2% 0
São Félix do Piauí – 3,083 2,820 629.58 5 0.1% 0
São Francisco de Assis do Piauí – 6,570 6,046 1,077.03 6 0.2% 0
São Francisco do Piauí – 6,722 5,044 1,346.9 5 0.2% 0
São Gonçalo do Gurguéia – 3,043 2,913 1,390.98 2 0.1% 0
São Gonçalo do Piauí – 1,691 1,399 150 11 0% 0
São João da Canabrava – 2,413 2,073 482.72 5 0.1% 0
São João da Fronteira – 5,909 5,517 820.81 7 0.2% 0
São João da Serra – 6,275 6,409 1,000.51 6 0.2% 0
São João da Varjota – 4,804 4,261 397.01 12 0.1% 0
São João do Arraial – 8,867 9,283 213.99 41 0.3% 0
São João do Piauí – 20,618 22,580 1,532.69 13 0.6% 0
São José do Divino – 5,841 5,140 321.43 18 0.2% 0
São José do Peixe – 3,741 3,024 1,291.95 3 0.1% 0
São José do Piauí – 7,202 6,951 375.57 19 0.2% 0
São Julião – 6,354 6,069 292.04 22 0.2% 0
São Lourenço do Piauí – 4,967 4,860 674.71 7 0.1% 0
São Luis do Piauí – 4,503 3,992 218.69 21 0.1% 0
São Miguel da Baixa Grande – 2,594 2,404 447.56 6 0.1% 0
São Miguel do Fidalgo – 3,128 2,859 817.53 4 0.1% 0
São Miguel do Tapuio – 18,937 18,426 5,009.93 4 0.5% 0
São Pedro do Piauí – 17,736 17,251 520.82 34 0.5% 0
São Raimundo Nonato – 36,747 42,315 2,424.8 15 1.1% 0
Sebastião Barros – 3,614 3,141 896.55 4 0.1% 0
Sebastião Leal – 4,608 4,764 3,166.38 1 0.1% 0
Sigefredo Pacheco – 9,828 8,802 1,036.2 9 0.3% 0
Simões – 15,530 15,346 1,079.49 14 0.5% 0
Simplício Mendes – 13,624 15,345 1,366.77 10 0.4% 0
Socorro do Piauí – 4,700 3,961 764.14 6 0.1% 0
Sussuapara – 6,437 5,831 206.97 31 0.2% 0
Tamboril do Piauí – 2,989 2,997 1,593.95 2 0.1% 0
Tanque do Piauí – 1,436 964 398.5 4 0% 0
Teresina – 976,839 908,324 1,398 699 28.3% 0
União – 23,453 22,825 1,180.21 20 0.7% 0
Uruçuí – 9,349 12,732 8,451.9 1 0.3% 0
Valença do Piauí – 21,164 23,411 1,339.19 16 0.6% 0
Várzea Branca – 4,378 4,559 453.24 10 0.1% 0
Várzea Grande – 6,139 5,957 237.77 26 0.2% 0
Vera Mendes – 2,912 3,030 342.28 9 0.1% 0
Vila Nova do Piauí – 3,585 3,219 222.85 16 0.1% 0
Wall Ferraz – 3,956 3,467 270.95 15 0.1% 0
05Exposure

Open exposure layers

Count of H3 resolution-3 cells whose centre falls in the unit and that carry each Natural Earth layer.

Urban areas
51 H3 cells
Bandari
None at this resolution
Viwanja vya ndege
None at this resolution
Major roads
3,315.6 H3 cells
Reli
379.4 H3 cells
Rivers and lakes
707.1 H3 cells
06Hatari

Risk values

Values when released. Subnational risk values for Piaui publish with the edition from The Global Risks Index. Until then, run a scenario on open data for Brazil.
Run a scenario Hazards Domain indices
07Neighbours

Neighbouring units

08Vyanzo

Sources, credits and licences

ADM1 boundaries
geoBoundaries (William & Mary geoLab), gbOpen BRA ADM1, source: geoBoundaries, Wikimedia Commons, licence: Creative Commons Attribution 2.5 Generic · source · represents 2006
ADM2 boundaries
geoBoundaries (William & Mary geoLab), gbOpen BRA ADM2, source: Instituto Brasileiro de Geografia e Estatística (IBGE), OCHA ROLAC, licence: Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO) · source · represents 2020
Basemap
OpenFreeMap © OpenMapTiles (CC BY 4.0) · data © OpenStreetMap contributors (ODbL 1.0). Vector tiles requested by the reader’s browser, unmodified; the map falls back to plain land and sea when the host does not answer.
Terrain
Terrain Tiles (Mapzen, AWS Open Data), compiled from SRTM and other public elevation sources (NASA, USGS, ETOPO1, GMTED, EU-DEM under the Copernicus programme, Geoscience Australia, Kartverket, INEGI, LINZ, data.gov.uk). Display relief, not survey data.
People
GHSL 2025 population grid, European Commission Joint Research Centre (CC BY 4.0), shown at 0.05° and summed per unit; WorldPop 2025 (CC BY 4.0) as a second estimate. Units smaller than a grid cell take the density of the cell under them.
Nchi
Natural Earth (public domain).
Elevation
GEBCO Compilation Group (2024) GEBCO 2024 Grid (public domain), reduced to 0.05°: the share of each cell’s land at or below 10 m, weighted by GHSL 2025 people for the low coastal zone.
Position
Boundaries are shown for location only and take no position on any boundary, name or status.

Hali

The methodology, structure and definitions of The Global Risks Index are a preparatory working draft (2026), circulated for review and comment and not for implementation. No value appears until an edition is released from a governed evidence cut; values then carry intervals, classes, sources and their correction pathway. Simulators run the published methods on numbers you choose and never show a NXS-GRX value.

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NXS-GRX si nini

NXS-GRX ni taarifa ya utafiti na uchambuzi wa hatari. Si daraja la mikopo wala la ESG na haitumii kipimo chochote cha daraja, si kigezo cha vyombo vya fedha, si takwimu rasmi, si onyo la dharura wala uainishaji rasmi, na si ushauri. Haipaswi kutumiwa kutathmini watu binafsi. Madaraja ya hatari ni mikanda kwenye kipimo kilichochapishwa, kamwe si mpangilio wa nchi au watu.

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Taasisi na vyanzo

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Every value carries the attribution of its sources, which keep their own licences. External names are cited for interoperability only. Nexus-authored text is intended for CC BY 4.0 on release.

Avis en français

La méthodologie et les définitions du NXS-GRX sont un projet de travail préparatoire (2026). Le NXS-GRX est une information de recherche et d’analyse des risques : ni notation, ni indice de référence financier, ni statistique officielle, ni alerte, ni conseil. Les classes de risque sont des bandes sur une échelle publiée, non des classements.