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Iwo, 
Nigeria
277,101 people lived in Iwo in 2025. It is the 2095th largest of the world's 12,138 cities, and the 75th largest in Nigeria.
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 Iwo grew
Where Iwo had 10 people in 1975, it had 18.6 in 2025.
On the UN's projection it will have 457,114 people in 2050. It passed 250,000 people between 2020 and 2025.
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
Iwo through your family’s years
Put in the years your family were born. You’ll see how many people lived in Iwo in each of those years, and when each of them turned 30.
Nigeria · every city · 2025
Where it is
How to read this: every dot is one of the 457 cities in Nigeria in 2025, and a dot's area is how many people live there, the biggest being Lagos. The ringed dot in colour is Iwo; 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, Iwo covered 46 km², and buildings, roads and other built-up land covered 12 km² of it. That is 42 m² of built-up land for each person, about a square 6 by 6 metres. Since 1975, its built-up land has grown to 3.9 times its size, and its people have grown by 86%.
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 Nigeria
Its share of Nigeria
Of every 1,000 people in Nigeria in 2025, 1 lived in Iwo, which is 277,101 people.
How to read this: 1,000 squares stand for everyone in Nigeria, one square for every 1,000th person. Count the coloured ones and you have Iwo's share; the grey remainder live somewhere else in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 2087 Saraf `Umrah Sudan278,467
- 2091 Murmansk Russia277,693
- 2092 Dhaulpur India277,498
- 2093 Taunggyi Myanmar277,312
- 2095 Iwo277,101
- 2096 Sarh Chad276,978
- 2097 Binangonan Philippines276,785
- 2099 Legazpi Philippines276,662
- 2101 San Pablo Philippines276,250
In Nigeria, 2025
- 1954 Birnin Kebbi296,331
- 2007 Okrika289,429
- 2053 Awka283,069
- 2064 Ikirun281,875
- 2095 Iwo277,101
- 2121 Magboro273,818
- 2151 Eket270,603
- 2160 Ijebu-Igbo269,742
- 2178 Lafia267,580
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 Iwo 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 Iwo 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