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Bo'ai, 
China
339,876 people lived in Bo'ai in 2025. It is the 1683rd largest of the world's 12,138 cities, and the 307th largest in China.
Like every city on this site, Bo'ai 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 Bo'ai grew
Where Bo'ai had 10 people in 1975, it had 63.2 in 2025.
On the UN's projection it will have 287,418 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: 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
Bo'ai through your family’s years
Put in the years your family were born. You’ll see how many people lived in Bo'ai in each of those years, and when each of them turned 30.
China · every city · 2025
Where it is
How to read this: Bo'ai 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, Bo'ai covered 112 km², and buildings, roads and other built-up land covered 27 km² of it. That is 80 m² of built-up land for each person, about a square 9 by 9 metres. Since 1975, its built-up land has grown to 10.4 times its size, and its people are 6.3 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 Bo'ai in 2025 — about 1 in 4,167.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1679 Pyŏngsŏng North Korea340,370
- 1680 Gojra Pakistan340,108
- 1681 Wazirabad Pakistan340,058
- 1682 Birpur India339,926
- 1683 Bo'ai339,876
- 1684 Bhagalpur India339,560
- 1685 Montería Colombia339,380
- 1686 Çerkezköy Türkiye338,995
- 1687 Yan'an338,883
In China, 2025
- 1670 Yanshi District342,565
- 1671 Dujiangyan342,467
- 1673 Qingzhou342,044
- 1675 Neijiang341,371
- 1683 Bo'ai339,876
- 1687 Yan'an338,883
- 1694 Sihui337,299
- 1699 Shuozhou336,303
- 1700 Ningguo336,274
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 Bo'ai 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 Bo'ai 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