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Siem Reap, 
Cambodia
352,948 people lived in Siem Reap in 2025. It is the 1621st largest of the world's 12,138 cities, and the 2nd largest in Cambodia.
Like every city on this site, Siem Reap 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 Siem Reap grew
Count 10 people in Siem Reap in 2000 and the same count gives 41.6 in 2025.
On the UN's projection it will have 637,174 people in 2050. It passed 250,000 people between 2015 and 2020. The UN first counts it as a city in 2000, when it passed 50,000 people.
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
Siem Reap through your family’s years
Put in the years your family were born. You’ll see how many people lived in Siem Reap in each of those years, and when each of them turned 30.
Cambodia · every city · 2025
Where it is
How to read this: Siem Reap is the dot in colour with a ring around it. The grey dots are the other cities of Cambodia in 2025, 10 in all, led by Phnom Penh, 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, Siem Reap covered 67 km², and buildings, roads and other built-up land covered 14 km² of it. That is 41 m² of built-up land for each person, about a square 6 by 6 metres. Since 2000, its built-up land has grown to 5.5 times its size, and its people are 4.2 times as many.
How to read this: the outer pale square stands for all the land the city covers, and the solid square inside it for the part with buildings, roads and the like on it. All three squares share a scale, so you can compare them by eye. A hatched one is a year the UN has projected.
Of every 100 people in Cambodia
Its share of Cambodia
Of every 100 people in Cambodia in 2025, 2 lived in Siem Reap, which is 352,948 people.
How to read this: 100 squares, one for every 100th person in Cambodia; the coloured squares live in Siem Reap. 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
- 1617 Haifeng China353,473
- 1618 Oak Ridge United States353,212
- 1619 Kurukshetra India353,119
- 1620 Nam Định Vietnam353,044
- 1621 Siem Reap352,948
- 1622 Utsunomiya Japan352,816
- 1623 Khurja India352,785
- 1624 Skopje North Macedonia352,624
- 1625 Madhubani India352,336
In Cambodia, 2025
- 222 Phnom Penh2,261,055
- 1621 Siem Reap352,948
- 3528 Anlong Veng172,053
How to read this: the number before each name is its place among all 12,138 cities in the world in 2025; bars are people, on one scale per list. Only cities that reach 300,000 people have a page here, so a gap in the numbers is a smaller city.
Apparatus
Sources and method
The figures for Siem Reap are the UN's own, at five-year steps: an estimate for each of 2000 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 Siem Reap 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