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Kiambu, 
Kenya
86,758 people lived in Kiambu in 2025. It is the 7167th largest of the world's 12,138 cities, and the 27th largest in Kenya.
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 Kiambu grew
Count 10 people in Kiambu in 2000 and the same count gives 16.6 in 2025.
On the UN's projection it will have 401,458 people in 2050. On the UN's projection it passes 250,000 people between 2040 and 2045. 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: 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
Kiambu through your family’s years
Put in the years your family were born. You’ll see how many people lived in Kiambu in each of those years, and when each of them turned 30.
Kenya · every city · 2025
Where it is
How to read this: every dot is one of the 50 cities in Kenya in 2025, and a dot's area is how many people live there, the biggest being Nairobi. The ringed dot in colour is Kiambu; the grey dots are the rest. The outlines around them are neighbouring countries.
Area and built-up land · km²
How much land it covers
In 2025, Kiambu covered 24 km², and buildings, roads and other built-up land covered 4.1 km² of it. That is 47 m² of built-up land for each person, about a square 7 by 7 metres. Since 2000, its built-up land has grown by 58%, and its people have grown by 66%.
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 Kenya
Its share of Kenya
Of every 1,000 people in Kenya in 2025, 2 lived in Kiambu, which is 86,758 people.
How to read this: 1,000 squares stand for everyone in Kenya, one square for every 1,000th person. Count the coloured ones and you have Kiambu's share; the grey remainder live somewhere else in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 6478 Gogi Ethiopia95,403
- 6672 Kipese Democratic Republic of the Congo92,786
- 6688 Fatehpur India92,631
- 6818 Bokhtar Tajikistan90,998
- 7167 Kiambu86,758
- 7454 Aweday Ethiopia83,488
- 7666 Bandar Seri Bentan Indonesia81,340
- 7728 Dawran AlJadeedah Yemen80,686
- 7734 Caxito Angola80,602
In Kenya, 2025
- 3249 Naivasha185,944
- 3687 Embu164,283
- 4078 Ongata Rongai148,823
- 5136 Vihiga119,644
- 7167 Kiambu86,758
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 Kiambu 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 Kiambu 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