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Auchi, 
Nigeria
212,634 people lived in Auchi in 2025. It is the 2789th largest of the world's 12,138 cities, and the 101st 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 Auchi grew
Count 10 people in Auchi in 1975 and the same count gives 30.7 in 2025.
On the UN's projection it will have 334,367 people in 2050. On the UN's projection it passes 250,000 people between 2030 and 2035.
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
Auchi through your family’s years
Put in the years your family were born. You’ll see how many people lived in Auchi in each of those years, and when each of them turned 30.
Nigeria · every city · 2025
Where it is
How to read this: Nigeria and its 457 cities in 2025, each a dot whose area is its number of people (the largest is Lagos). Auchi is ringed, in colour; the other cities are grey. Neighbouring countries are outlines.
Area and built-up land · km²
How much land it covers
In 2025, Auchi covered 43 km², and buildings, roads and other built-up land covered 10 km² of it. That is 49 m² of built-up land for each person, about a square 7 by 7 metres. Since 1975, its built-up land has grown to 3.5 times its size, and its people are 3.1 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, 1 lived in Auchi, which is 212,634 people.
How to read this: shrink Nigeria to 1,000 people and this is what you get. The coloured squares are the ones who would live in Auchi; the grey ones are everybody else, in other cities, in towns and out in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 2774 Mulia Indonesia213,704
- 2775 Ica Peru213,644
- 2776 Shindand Afghanistan213,596
- 2788 Inayat Killi Pakistan212,640
- 2789 Auchi212,634
- 2795 Am Timan Chad212,167
- 2796 Narus South Sudan212,131
- 2797 Bandundu Democratic Republic of the Congo212,016
- 2799 Darauli India211,985
In Nigeria, 2025
- 2624 Ile Oluji224,781
- 2679 Gwoza220,641
- 2706 Omuo-Obadore218,751
- 2713 Okitipupa218,097
- 2789 Auchi212,634
- 2861 Uromi208,157
- 2971 Afikpo201,084
- 2981 Omoku200,802
- 3032 Dutse197,314
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 Auchi 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 Auchi 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