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Cluj-Napoca, 
Romania
310,650 people lived in Cluj-Napoca in 2025. It is the 1848th largest of the world's 12,138 cities, and the 3rd largest in Romania.
Like every city on this site, Cluj-Napoca is counted as a built-up area seen from above rather than as a city government's territory. Why that changes the number.
Verified 2026-09-30 · 73 canaries
People · every five years · 1975 to 2050
How Cluj-Napoca grew
For every 10 people in Cluj-Napoca in 1975, there were 11.6 in 2025.
On the UN's projection it will have 298,725 people in 2050.
projected (after 2025) · how sure the UN is: high moderate low
How to read this: one column every five years, 1975 to 2050; its height is the number of people. Hatched columns are the UN's projection. The thin strip beneath says how sure the UN is of each figure: the stronger the colour, the surer. A blank means the place was not on the UN's list of cities that year.
People · your family's years · 1975 to 2050
Cluj-Napoca through your family’s years
Put in the years your family were born. You’ll see how many people lived in Cluj-Napoca in each of those years, and when each of them turned 30.
Romania · every city · 2025
Where it is
How to read this: every dot is one of the 29 cities in Romania in 2025, and a dot's area is how many people live there, the biggest being Bucharest. The ringed dot in colour is Cluj-Napoca; 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, Cluj-Napoca covered 46 km², and buildings, roads and other built-up land covered 12 km² of it. That is 40 m² of built-up land for each person, about a square 6 by 6 metres. Since 1975, its built-up land has grown by 43%, and its people have grown by 16%.
How to read this: each pale square is the city's whole area, the strong square inside it the part that is built on; one scale for all three, so a bigger square is more land. Hatched is the UN's projection.
Of every 100 people in Romania
Its share of Romania
Of every 100 people in Romania in 2025, 2 lived in Cluj-Napoca, which is 310,650 people.
How to read this: shrink Romania to 100 people and this is what you get. The coloured squares are the ones who would live in Cluj-Napoca; the grey ones are everybody else, in other cities, in towns and out in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1844 Rouen France311,071
- 1845 Modesto United States310,818
- 1846 Pachuca Mexico310,805
- 1847 Brno Czechia310,796
- 1848 Cluj-Napoca310,650
- 1849 Gorgan Iran310,644
- 1850 Aktau Kazakhstan310,607
- 1851 Campos dos Goytacazes Brazil310,590
- 1852 Sungai Petani Malaysia310,566
In Romania, 2025
- 262 Bucharest1,909,536
- 1801 Timișoara319,240
- 1848 Cluj-Napoca310,650
- 2104 Iași275,840
- 2169 Constanța268,757
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 Cluj-Napoca 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 Cluj-Napoca 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