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Siwan, 
India
300,919 people lived in Siwan in 2025. It is the 1905th largest of the world's 12,138 cities, and the 313th largest in India.
That figure counts the whole built-up area, not the area Siwan 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 Siwan grew
Where Siwan had 10 people in 1975, it had 25 in 2025.
On the UN's projection it will have 384,884 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
Siwan through your family’s years
Put in the years your family were born. You’ll see how many people lived in Siwan in each of those years, and when each of them turned 30.
India · every city · 2025
Where it is
How to read this: Siwan is the dot in colour with a ring around it. The grey dots are the other cities of India in 2025, 2,054 in all, led by New Delhi, 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, Siwan covered 32 km², and buildings, roads and other built-up land covered 5.2 km² of it. That is 17 m² of built-up land for each person, about a square 4 by 4 metres. Since 1975, its built-up land has grown to 5.2 times its size, and its people are 2.5 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 India
Its share of India
Fewer than 1 in every 1,000 people in India lived in Siwan in 2025 — about 1 in 4,762.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1901 Jigani301,763
- 1902 Changxing China301,206
- 1903 Hammond United States301,148
- 1904 Amroha301,108
- 1905 Siwan300,919
- 1906 Khanewal Pakistan300,722
- 1907 Ado Nigeria300,622
- 1908 Singaraja Indonesia300,490
- 1909 Shaistaganj Bangladesh300,465
In India, 2025
- 1896 Sivakasi302,256
- 1899 Orai301,946
- 1901 Jigani301,763
- 1904 Amroha301,108
- 1905 Siwan300,919
- 1910 Sirsa300,414
- 1918 Anantnag299,385
- 1939 Karur297,598
- 1947 Attingal297,140
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 Siwan 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 Siwan 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