Topics
Iași, 
Romania
275,840 people lived in Iași in 2025. It is the 2104th largest of the world's 12,138 cities, and the 4th largest in Romania.
That figure counts the whole built-up area, not the area Iași 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 Iași grew
Count 10 people in Iași in 1975 and the same count gives 12.4 in 2025.
On the UN's projection it will have 254,340 people in 2050. It passed 250,000 people between 1975 and 1980.
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
Iași through your family’s years
Put in the years your family were born. You’ll see how many people lived in Iași in each of those years, and when each of them turned 30.
Romania · every city · 2025
Where it is
How to read this: Iași is the dot in colour with a ring around it. The grey dots are the other cities of Romania in 2025, 29 in all, led by Bucharest, each drawn with an area that matches its people. Countries next door are outlines only.
Area and built-up land · km²
How much land it covers
In 2025, Iași covered 47 km², and buildings, roads and other built-up land covered 11 km² of it. That is 41 m² of built-up land for each person, about a square 6 by 6 metres. Since 1975, its built-up land has grown by 62%, and its people have grown by 24%.
How to read this: the outer pale square stands for all the land the city covers, and the solid square inside it for the part with buildings, roads and the like on it. All three squares share a scale, so you can compare them by eye. A hatched one is a year the UN has projected.
Of every 100 people in Romania
Its share of Romania
Of every 100 people in Romania in 2025, 1 lived in Iași, which is 275,840 people.
How to read this: 100 squares stand for everyone in Romania, one square for every 100th person. Count the coloured ones and you have Iași's share; the grey remainder live somewhere else in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 2097 Binangonan Philippines276,785
- 2099 Legazpi Philippines276,662
- 2101 San Pablo Philippines276,250
- 2103 Jiroft Iran276,001
- 2104 Iași275,840
- 2105 Erin Woods Canada275,476
- 2106 Glenfield New Zealand275,322
- 2107 Morbi India275,191
- 2108 Pinggu China274,753
In Romania, 2025
- 262 Bucharest1,909,536
- 1801 Timișoara319,240
- 1848 Cluj-Napoca310,650
- 2104 Iași275,840
- 2169 Constanța268,757
How to read this: the figure in front of a name is where that city stands among the 12,138 cities the UN counted in 2025, and each bar is its people, on one scale per list. Numbers are missing where a city has fewer than 300,000 people and so has no page of its own.
Apparatus
Sources and method
The figures for Iași 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 Iași 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