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Dumai, 
Indonesia
317,280 people lived in Dumai in 2025. It is the 1807th largest of the world's 12,138 cities, and the 63rd largest in Indonesia.
That figure counts the whole built-up area, not the area Dumai 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 Dumai grew
Where Dumai had 10 people in 1975, it had 58.6 in 2025.
On the UN's projection it will have 485,480 people in 2050. It passed 250,000 people between 2010 and 2015.
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
Dumai through your family’s years
Put in the years your family were born. You’ll see how many people lived in Dumai in each of those years, and when each of them turned 30.
Indonesia · every city · 2025
Where it is
How to read this: Dumai is the dot in colour with a ring around it. The grey dots are the other cities of Indonesia in 2025, 389 in all, led by Jakarta, 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, Dumai covered 36 km², and buildings, roads and other built-up land covered 7.5 km² of it. That is 24 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 times its size, and its people are 5.9 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 Indonesia
Its share of Indonesia
Of every 1,000 people in Indonesia in 2025, 1 lived in Dumai, which is 317,280 people.
How to read this: shrink Indonesia to 1,000 people and this is what you get. The coloured squares are the ones who would live in Dumai; the grey ones are everybody else, in other cities, in towns and out in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1803 Zhangqiu China319,153
- 1804 Sosnowiec Poland318,955
- 1805 Qili China318,490
- 1806 Malmo Sweden318,242
- 1807 Dumai317,280
- 1808 Al-Qadarif Sudan317,258
- 1809 Nazirhat Bangladesh317,240
- 1810 Magnitogorsk Russia317,107
- 1811 Bhusawal India317,085
In Indonesia, 2025
- 1707 Indramayu335,572
- 1767 Sumedang324,936
- 1770 Pandeglang324,139
- 1774 Bodeh323,511
- 1807 Dumai317,280
- 1836 Kebumen312,542
- 1908 Singaraja300,490
- 1919 Bukittinggi299,353
- 1921 Sorong299,181
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 Dumai 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 Dumai 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