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Brno, 
Czechia
310,796 people lived in Brno in 2025. It is the 1847th largest of the world's 12,138 cities, and the 2nd largest in Czechia.
That figure counts the whole built-up area, not the area Brno 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 Brno grew
For every 10 people in Brno in 1975, there were 10.5 in 2025.
On the UN's projection it will have 285,861 people in 2050.
projected (after 2025) · how sure the UN is: high moderate low
How to read this: each column is one of the UN's five-yearly estimates, 1975 through 2050, and taller means more people. Where a column is hatched the year has not happened yet. The strip under the columns is the UN's own confidence in each figure, palest where it is least sure; where it is blank the city was not on the list at all.
People · your family's years · 1975 to 2050
Brno through your family’s years
Put in the years your family were born. You’ll see how many people lived in Brno in each of those years, and when each of them turned 30.
Czechia · every city · 2025
Where it is
How to read this: every dot is one of the 12 cities in Czechia in 2025, and a dot's area is how many people live there, the biggest being Prague. The ringed dot in colour is Brno; 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, Brno covered 78 km², and buildings, roads and other built-up land covered 19 km² of it. That is 60 m² of built-up land for each person, about a square 8 by 8 metres. Since 1975, its built-up land has grown by 39%, and its people have grown by 5%.
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 Czechia
Its share of Czechia
Of every 100 people in Czechia in 2025, 3 lived in Brno, which is 310,796 people.
How to read this: 100 squares stand for everyone in Czechia, one square for every 100th person. Count the coloured ones and you have Brno's share; the grey remainder live somewhere else in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1843 Arlington United States311,130
- 1844 Rouen France311,071
- 1845 Modesto United States310,818
- 1846 Pachuca Mexico310,805
- 1847 Brno310,796
- 1848 Cluj-Napoca Romania310,650
- 1849 Gorgan Iran310,644
- 1850 Aktau Kazakhstan310,607
- 1851 Campos dos Goytacazes Brazil310,590
In Czechia, 2025
- 430 Prague1,197,765
- 1847 Brno310,796
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 Brno are the UN's own, at five-year steps: an estimate for each of 1975 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 Brno 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