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Umuahia, 
Nigeria
843,245 people lived in Umuahia in 2025. It is the 622nd largest of the world's 12,138 cities, and the 21st largest in Nigeria.
The UN measures every city in the world the same way, by where the buildings are rather than where the boundary runs, so this figure and Umuahia's own can differ widely. What counts as a city here.
Verified 2026-09-30 · 73 canaries
People · every five years · 1975 to 2050
How Umuahia grew
Count 10 people in Umuahia in 1985 and the same count gives 147.6 in 2025.
On the UN's projection it will have 1.5 million people in 2050. On the UN's projection it passes a million people between 2030 and 2035. The UN first counts it as a city in 1985, when it passed 50,000 people.
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
Umuahia through your family’s years
Put in the years your family were born. You’ll see how many people lived in Umuahia in each of those years, and when each of them turned 30.
Nigeria · every city · 2025
Where it is
How to read this: Umuahia is the dot in colour with a ring around it. The grey dots are the other cities of Nigeria in 2025, 457 in all, led by Lagos, 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, Umuahia covered 140 km², and buildings, roads and other built-up land covered 21 km² of it. That is 24 m² of built-up land for each person, about a square 5 by 5 metres. Since 1985, its built-up land has grown to 5.7 times its size, and its people are 14.8 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 Nigeria
Its share of Nigeria
Of every 1,000 people in Nigeria in 2025, 4 lived in Umuahia, which is 843,245 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 Umuahia's share; the grey remainder live somewhere else in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 618 Mérida Mexico847,166
- 619 Gujrat Pakistan846,968
- 620 Faiyum Egypt846,831
- 621 Maracay Venezuela845,329
- 622 Umuahia843,245
- 623 Bakhtiyarpur India843,195
- 624 Kotwali India839,900
- 625 Cuernavaca Mexico839,485
- 626 Fuyang China839,236
In Nigeria, 2025
- 503 Otite1,020,218
- 561 Jos923,652
- 565 Ikorodu916,166
- 572 Sokoto903,238
- 622 Umuahia843,245
- 633 Nsukka830,196
- 659 Abeokuta801,826
- 668 Oyo793,241
- 705 Yola758,153
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 Umuahia are the UN's own, at five-year steps: an estimate for each of 1985 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 Umuahia 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