União Population 2026
União has a population of 46,119, making it the #720 biggest city in 🇧🇷 Brazil, located in Piauí. It is about 269× smaller than São Paulo, the country's biggest city.
Population (city proper)
46,119
Rank in Brazil
#720
Coordinates
4.59°S, 42.86°W
~60 m elevation · America/Fortaleza
Distance to capital (Brasília)
1,362 km
846 miles, straight line
Other big cities in Piauí
Cities near União
- José de Freitas42,559 people · ~37 km away
- Coelho Neto41,658 people · ~40 km away
- Miguel Alves32,150 people · ~47 km away
- Teresina871,126 people · ~56 km away
- Timon174,465 people · ~57 km away
- Caxias156,973 people · ~62 km away
FAQ
What is the population of União?
União has a population of 46,119 (city proper, latest official figure via GeoNames), making it the #720 biggest city in Brazil.
What region is União in?
União is located in Piauí, Brazil.
Is União the capital of Brazil?
No, the capital of Brazil is Brasília, about 1,362 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.