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St. Louis, 
United States
663,392 people lived in St. Louis in 2025. It is the 817th largest of the world's 12,138 cities, and the 30th largest in the United States.
That figure counts the whole built-up area, not the area St. Louis 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 St. Louis grew
Count 10 people in St. Louis in 1975 and the same count gives 12.4 in 2025.
On the UN's projection it will have 651,001 people in 2050.
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
St. Louis through your family’s years
Put in the years your family were born. You’ll see how many people lived in St. Louis in each of those years, and when each of them turned 30.
United States · every city · 2025
Where it is
How to read this: St. Louis is the dot in colour with a ring around it. The grey dots are the other cities of the United States in 2025, 348 in all, led by New York City, 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, St. Louis covered 330 km², and buildings, roads and other built-up land covered 71 km² of it. That is 107 m² of built-up land for each person, about a square 10 by 10 metres. Since 1975, its built-up land has grown by 58%, and its people have grown by 24%.
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 United States
Its share of the United States
Of every 1,000 people in the United States in 2025, 2 lived in St. Louis, which is 663,392 people.
How to read this: 1,000 squares, one for every 1,000th person in the United States; the coloured squares live in St. Louis. 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
- 813 Maradi Niger666,205
- 814 Changwon South Korea665,772
- 815 Fushun China665,286
- 816 Anand India664,789
- 817 St. Louis663,392
- 818 Blida Algeria663,070
- 819 Leiyang China662,696
- 820 Wuppertal Germany662,663
- 821 Kannur India662,128
In the United States, 2025
- 653 Detroit809,894
- 732 Columbus731,335
- 764 Milwaukee701,928
- 785 Fresno685,330
- 817 St. Louis663,392
- 873 West Palm Beach617,035
- 898 El Paso605,731
- 965 Norfolk567,473
- 994 Tampa551,988
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 St. Louis 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 St. Louis 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