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Changji/Sanji, 
China
381,391 people lived in Changji/Sanji in 2025. It is the 1490th largest of the world's 12,138 cities, and the 277th largest in China.
The UN measures every city in the world the same way, by where the buildings are rather than where the boundary runs, so this figure and Changji/Sanji's own can differ widely. What counts as a city here.
Verified 2026-09-30 · 73 canaries
People · every five years · 1975 to 2050
How Changji/Sanji grew
Where Changji/Sanji had 10 people in 1975, it had 38.6 in 2025.
On the UN's projection it will have 418,271 people in 2050. It passed 250,000 people between 1995 and 2000.
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
Changji/Sanji through your family’s years
Put in the years your family were born. You’ll see how many people lived in Changji/Sanji in each of those years, and when each of them turned 30.
China · every city · 2025
Where it is
How to read this: every dot is one of the 2,082 cities in China in 2025, and a dot's area is how many people live there, the biggest being Shanghai. The ringed dot in colour is Changji/Sanji; 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, Changji/Sanji covered 38 km², and buildings, roads and other built-up land covered 9.8 km² of it. That is 26 m² of built-up land for each person, about a square 5 by 5 metres. Since 1975, its built-up land has grown to 5.2 times its size, and its people are 3.9 times as many.
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 China
Its share of China
Fewer than 1 in every 1,000 people in China lived in Changji/Sanji in 2025 — about 1 in 3,704.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1486 Badaun India382,686
- 1487 Pohang-si South Korea382,368
- 1488 Guangyuan381,738
- 1489 Las Palmas de Gran Canaria Spain381,670
- 1490 Changji/Sanji381,391
- 1491 Kas Sudan381,286
- 1492 Bandar Abbas Iran381,008
- 1493 Mahilioŭ Belarus380,951
- 1494 Dongyang380,793
In China, 2025
- 1477 Fuqing385,081
- 1480 Haicheng383,983
- 1482 Tongling383,739
- 1488 Guangyuan381,738
- 1490 Changji/Sanji381,391
- 1494 Dongyang380,793
- 1499 Laiwu379,135
- 1511 Xinghua375,876
- 1519 Haimen374,644
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 Changji/Sanji 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 Changji/Sanji 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