Castelo do Piauí Population 2026
Castelo do Piauí has a population of 19,288, making it the #1806 biggest city in 🇧🇷 Brazil, located in Piauí. It is about 643× smaller than São Paulo, the country's biggest city.
Population (city proper)
19,288
Rank in Brazil
#1806
Coordinates
5.32°S, 41.55°W
~241 m elevation · America/Fortaleza
Distance to capital (Brasília)
1,355 km
841 miles, straight line
Other big cities in Piauí
Cities near Castelo do Piauí
- São Miguel do Tapuio17,554 people · ~32 km away
- Campo Maior45,793 people · ~88 km away
- Novo Oriente27,545 people · ~89 km away
- Crateús76,390 people · ~99 km away
- Pedro II37,894 people · ~100 km away
- Altos47,453 people · ~105 km away
FAQ
What is the population of Castelo do Piauí?
Castelo do Piauí has a population of 19,288 (city proper, latest official figure via GeoNames), making it the #1806 biggest city in Brazil.
What region is Castelo do Piauí in?
Castelo do Piauí is located in Piauí, Brazil.
Is Castelo do Piauí the capital of Brazil?
No, the capital of Brazil is Brasília, about 1,355 km away.
Sources & notes
Population refers to the city proper (municipal boundaries), not the metropolitan area. Source: GeoNames (CC BY 4.0), retrieved 2026-07-07. Country data: UN World Population Prospects 2024.