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Cheonan-si, 
South Korea
428,378 people lived in Cheonan-si in 2025. It is the 1304th largest of the world's 12,138 cities, and the 10th largest in South Korea.
That figure counts the whole built-up area, not the area Cheonan-si 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 Cheonan-si grew
Where Cheonan-si had 10 people in 1975, it had 72.2 in 2025.
On the UN's projection it will have 383,153 people in 2050. It passed 250,000 people between 2000 and 2005.
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
Cheonan-si through your family’s years
Put in the years your family were born. You’ll see how many people lived in Cheonan-si in each of those years, and when each of them turned 30.
South Korea · every city · 2025
Where it is
How to read this: South Korea and its 49 cities in 2025, each a dot whose area is its number of people (the largest is Seoul). Cheonan-si is ringed, in colour; the other cities are grey. Neighbouring countries are outlines.
Area and built-up land · km²
How much land it covers
In 2025, Cheonan-si covered 80 km², and buildings, roads and other built-up land covered 19 km² of it. That is 44 m² of built-up land for each person, about a square 7 by 7 metres. Since 1975, its built-up land has grown to 5.9 times its size, and its people are 7.2 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 South Korea
Its share of South Korea
Of every 1,000 people in South Korea in 2025, 8 lived in Cheonan-si, which is 428,378 people.
How to read this: 1,000 squares, one for every 1,000th person in South Korea; the coloured squares live in Cheonan-si. 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
- 1300 Katihar India430,470
- 1301 Chandpur Bangladesh430,144
- 1302 Providence United States429,694
- 1303 Santiago de Cuba Cuba429,537
- 1304 Cheonan-si428,378
- 1305 Huidong China428,137
- 1306 Samadon Egypt428,126
- 1307 Khansahib India428,041
- 1308 Coventry United Kingdom427,678
In South Korea, 2025
- 588 Ulsan881,858
- 780 Cheongju-si690,333
- 814 Changwon665,772
- 848 Jeonju637,082
- 1304 Cheonan-si428,378
- 1487 Pohang-si382,368
- 1955 Gumi-si296,323
- 2463 Jinju-si237,707
- 3680 Iksan-si164,566
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 Cheonan-si 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 Cheonan-si 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