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Cities · Republic of the Congo
Impfondo, 
Republic of the Congo
89,540 people lived in Impfondo in 2005, the last year the UN lists it as a city. After 2005 it is no longer on the list, and the UN does not say whether it fell below 50,000 people or grew into a neighbouring city.
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 Impfondo grew
For every 10 people in Impfondo in 1975, there were 2.1 in 2005: it shrank.
It leaves the UN's list after 2005. The UN's figures for Impfondo fall from 435,357 in 1975 to 89,540 in 2005. The UN rates its own confidence in the 1975 figure as moderate: cities are counted from census maps, and where those are old or coarse the figures are least certain.
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
Impfondo through your family’s years
Put in the years your family were born. You’ll see how many people lived in Impfondo in each of those years, and when each of them turned 30.
Republic of the Congo · every city · 2025
Where it is
How to read this: Impfondo is the dot in colour with a ring around it, sized as it was in 2005. The grey dots are the other cities of the Republic of the Congo in 2025, 4 in all, led by Brazzaville, 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 2005, Impfondo covered 12 km², and buildings, roads and other built-up land covered 1.3 km² of it. That is 15 m² of built-up land for each person, about a square 4 by 4 metres. Since 1975, its built-up land has grown by 30%, and its people have fallen by 79%.
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 the Republic of the Congo
Its share of the Republic of the Congo
Of every 100 people in the Republic of the Congo in 2005, 2 lived in Impfondo, which is 89,540 people.
How to read this: 100 squares, one for every 100th person in the Republic of the Congo; the coloured squares live in Impfondo. The grey rest live in other cities, in towns or in the countryside.
Ranked by people · 2025
Cities of a similar size
In the Republic of the Congo, 2025
- 126 Brazzaville3,656,322
- 294 Pointe-Noire1,662,537
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 Impfondo are the UN's own, at five-year steps: an estimate for each of 1975 to 2005, 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 Impfondo 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