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Youyi, 
China
680,993 people lived in Youyi in 2025. It is the 794th largest of the world's 12,138 cities, and the 136th largest in China.
This is the UN's built-up area, drawn from satellite pictures and census maps rather than from the city limits, and the two can be a long way apart. The rule behind it.
Verified 2026-09-30 · 73 canaries
People · every five years · 1975 to 2050
How Youyi grew
Count 10 people in Youyi in 1975 and the same count gives 23.2 in 2025.
On the UN's projection it will have 650,889 people in 2050.
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
Youyi through your family’s years
Put in the years your family were born. You’ll see how many people lived in Youyi in each of those years, and when each of them turned 30.
China · every city · 2025
Where it is
How to read this: Youyi is the dot in colour with a ring around it. The grey dots are the other cities of China in 2025, 2,082 in all, led by Shanghai, 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, Youyi covered 75 km², and buildings, roads and other built-up land covered 16 km² of it. That is 23 m² of built-up land for each person, about a square 5 by 5 metres. Since 1975, its built-up land has grown to 2.9 times its size, and its people are 2.3 times as many.
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 China
Its share of China
Fewer than 1 in every 1,000 people in China lived in Youyi in 2025 — about 1 in 2,083.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 790 Florianópolis Brazil682,065
- 791 Longgang681,306
- 792 Santiago de los Caballeros Dominican Republic681,087
- 793 San Juan Puerto Rico681,030
- 794 Youyi680,993
- 795 Jamnagar India680,589
- 796 Winnipeg Canada679,037
- 797 Garoua Cameroon678,769
- 798 Kitwe Zambia678,749
In China, 2025
- 772 Donghe696,169
- 776 Dazhou693,707
- 784 Zhoukou689,599
- 791 Longgang681,306
- 794 Youyi680,993
- 799 Jingzhou678,632
- 800 Ankang678,483
- 803 Shangqiu676,590
- 804 Bazhong City675,756
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 Youyi 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 Youyi 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