Erin-osun, Nigeria

Where Erin-osun had 10 people in 1975, it had 37.8 in 2025.

On the UN's projection it will have 503,291 people in 2050. It passed 250,000 people between 2010 and 2015.

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.

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 Erin-osun; the grey dots are the rest. The outlines around them are neighbouring countries.

In 2025, Erin-osun covered 46 km², and buildings, roads and other built-up land covered 11 km² of it. That is 34 m² of built-up land for each person, about a square 6 by 6 metres. Since 1975, its built-up land has grown to 4.3 times its size, and its people are 3.8 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 1,000 people in Nigeria in 2025, 1 lived in Erin-osun, which is 330,484 people.

How to read this: 1,000 squares, one for every 1,000th person in Nigeria; the coloured squares live in Erin-osun. The grey rest live in other cities, in towns or in the countryside.

In the world, 2025

1. 1733 Nuevo Laredo Mexico331,195
2. 1734 Gravataí Brazil330,969
3. 1735 Murcia Spain330,966
4. 1736 Ikare330,941
5. 1737 Erin-osun330,484
6. 1738 Xuanwei China330,467
7. 1739 Dashiqiao China330,302
8. 1740 Riwoto South Sudan330,053
9. 1741 Plovdiv Bulgaria329,838

In Nigeria, 2025

1. 1690 Ikere-Ekiti338,367
2. 1708 Bonny335,542
3. 1721 Gwagwalada333,464
4. 1736 Ikare330,941
5. 1737 Erin-osun330,484
6. 1818 Sapele315,614
7. 1874 Ughelli307,005
8. 1900 Owo301,931
9. 1907 Ado300,622

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.

Nigeria · All the world's cities

The figures for Erin-osun 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 Erin-osun 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