Map of União, Brazil

União is a city in Piauí, Brazil, with a population of about 46,119. It lies at 4.5858°S, 42.8642°W. União is about 1,362 km (846 mi) northeast of Brasília, the capital. The nearest city on our map is José de Freitas, 37 km to the southeast.

União at a glance

Where is União?

• The 9th largest city in Piauí on this site.
• Located in the Southern and Western hemispheres.
• Daylight ranges from about 11 h 51 min on the shortest day to 12 h 23 min on the longest day (around 21 June and 21 December).

Cities near União

• José de Freitas — 37 km southeast
• Coelho Neto — 40 km northwest
• Miguel Alves — 47 km north
• Teresina — 56 km south
• Timon — 57 km south
• Caxias — 62 km southwest
• Altos — 67 km southeast
• Barras — 74 km northeast
• Campo Maior — 82 km east
• Brejo — 101 km north

Largest cities in Piauí

• Teresina — 871,126
• Parnaíba — 170,491
• Picos — 83,090
• Piripiri — 63,787
• Floriano — 62,036
• Barras — 47,938
• Altos — 47,453
• Campo Maior — 46,893
• Esperantina — 40,970
• José de Freitas — 39,336

Largest cities in Brazil

• São Paulo — 12,400,232
• Rio de Janeiro — 6,747,815
• Belo Horizonte — 2,721,564
• Salvador — 2,711,840
• Fortaleza — 2,400,000
• Manaus — 2,219,580
• Brasília — 2,207,718
• Curitiba — 1,948,626
• Recife — 1,653,461
• Goiânia — 1,536,097

Map of Brazil and all its cities →

Sources: place names, coordinates, populations and time zones from GeoNames (CC BY 4.0, data retrieved October 2026). Population figures are the latest values recorded in GeoNames; depending on the country they refer to the city proper, a municipality or a wider urban area, so they can differ from census or metro-area figures. Map © OpenStreetMap contributors.