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Rio Branco, 
Brazil
332,810 people lived in Rio Branco in 2025. It is the 1725th largest of the world's 12,138 cities, and the 55th largest in Brazil.
That figure counts the whole built-up area, not the area Rio Branco governs, so it may be far from the number the city publishes about itself. How the UN measures a city.
Verified 2026-09-30 · 73 canaries
People · every five years · 1975 to 2050
How Rio Branco grew
Count 10 people in Rio Branco in 1985 and the same count gives 40.2 in 2025.
On the UN's projection it will have 421,157 people in 2050. It passed 250,000 people between 2005 and 2010. The UN first counts it as a city in 1985, when it passed 50,000 people.
projected (after 2025) · how sure the UN is: high moderate low
How to read this: read it left to right, 1975 to 2050, one column every five years, the height being people. Hatching marks the projected years. Below, a strip of the UN's confidence: strong colour where the census maps are recent and detailed, pale where they are not, blank where the place was not counted as a city.
People · your family's years · 1975 to 2050
Rio Branco through your family’s years
Put in the years your family were born. You’ll see how many people lived in Rio Branco in each of those years, and when each of them turned 30.
Brazil · every city · 2025
Where it is
How to read this: every dot is one of the 356 cities in Brazil in 2025, and a dot's area is how many people live there, the biggest being São Paulo. The ringed dot in colour is Rio Branco; the grey dots are the rest. The outlines around them are neighbouring countries.
Area and built-up land · km²
How much land it covers
In 2025, Rio Branco covered 74 km², and buildings, roads and other built-up land covered 18 km² of it. That is 53 m² of built-up land for each person, about a square 7 by 7 metres. Since 1985, its built-up land has grown to 2.1 times its size, and its people are 4 times as many.
How to read this: pale is the whole of the city's land; the stronger square inside it is what is actually built on. The three are drawn to the same scale, so a larger square really is more land, and hatching means the year is the UN's projection rather than a count.
Of every 100 people in Brazil
Its share of Brazil
Of every 1,000 people in Brazil in 2025, 2 lived in Rio Branco, which is 332,810 people.
How to read this: 1,000 squares, one for every 1,000th person in Brazil; the coloured squares live in Rio Branco. The grey rest live in other cities, in towns or in the countryside.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1721 Gwagwalada Nigeria333,464
- 1722 Basel Switzerland333,021
- 1723 Nicosia Cyprus333,008
- 1724 Rudrapur India332,826
- 1725 Rio Branco332,810
- 1726 Sasaram India332,715
- 1727 Hui'an China332,559
- 1728 Stoke-on-Trent United Kingdom332,542
- 1729 Yokkaichi Japan332,173
In Brazil, 2025
- 1627 Praia Grande352,067
- 1630 Bauru351,405
- 1652 Francisco Morato346,105
- 1692 Franca337,878
- 1725 Rio Branco332,810
- 1734 Gravataí330,969
- 1766 Canoas325,022
- 1834 Uberaba312,745
- 1851 Campos dos Goytacazes310,590
How to read this: names are in order of size, the leading number being each city's rank among all 12,138 in 2025; the bars share a scale within a list. A jump in the ranks means a city under 300,000 people, which is not given a page here.
Apparatus
Sources and method
The figures for Rio Branco are the UN's own, at five-year steps: an estimate for each of 1985 to 2025, then projection to 2050. Projected years are drawn hatched, and the UN publishes no range of uncertainty for a city. What a city means here, how the UN measures one, and why that number can differ from the one Rio Branco publishes about itself: how the figures here are put together.
Sources: UN WUP 2025 · Natural Earth · flag-icons. Every source, its licence and how to cite it →
Verified 2026-09-30 · 73 canaries