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Longueuil, 
Canada
351,819 people lived in Longueuil in 2025. It is the 1629th largest of the world's 12,138 cities, and the 12th largest in Canada.
That figure counts the whole built-up area, not the area Longueuil governs, so it may be far from the number the city publishes about itself. How the UN measures a city.
Verified 2026-09-30 · 73 canaries
People · every five years · 1975 to 2050
How Longueuil grew
Where Longueuil had 10 people in 1975, it had 14 in 2025.
On the UN's projection it will have 370,108 people in 2050.
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
Longueuil through your family’s years
Put in the years your family were born. You’ll see how many people lived in Longueuil in each of those years, and when each of them turned 30.
Canada · every city · 2025
Where it is
How to read this: Canada and its 56 cities in 2025, each a dot whose area is its number of people (the largest is Toronto). Longueuil 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, Longueuil covered 107 km², and buildings, roads and other built-up land covered 27 km² of it. That is 77 m² of built-up land for each person, about a square 9 by 9 metres. Since 1975, its built-up land has grown by 42%, and its people have grown by 40%.
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 Canada
Its share of Canada
Of every 1,000 people in Canada in 2025, 9 lived in Longueuil, which is 351,819 people.
How to read this: 1,000 squares, one for every 1,000th person in Canada; the coloured squares live in Longueuil. The grey rest live in other cities, in towns or in the countryside.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1625 Madhubani India352,336
- 1626 Temuco Chile352,200
- 1627 Praia Grande Brazil352,067
- 1628 Karimnagar India351,832
- 1629 Longueuil351,819
- 1630 Bauru Brazil351,405
- 1631 Mwene-Ditu Democratic Republic of the Congo351,319
- 1632 Xinyang China351,064
- 1633 Purulia India350,713
In Canada, 2025
- 1134 Quebec490,451
- 1226 Surrey454,230
- 1292 Hamilton432,788
- 1579 London362,006
- 1629 Longueuil351,819
- 1644 Kitchener347,723
- 1842 Oshawa311,294
- 2105 Erin Woods275,476
- 2128 Saskatoon273,454
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 Longueuil 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 Longueuil 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