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San Juan, 
Argentina
464,466 people lived in San Juan in 2025. It is the 1198th largest of the world's 12,138 cities, and the 9th largest in Argentina.
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 San Juan grew
For every 10 people in San Juan in 1975, there were 21.8 in 2025.
On the UN's projection it will have 502,548 people in 2050. It passed 250,000 people between 1980 and 1985.
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
San Juan through your family’s years
Put in the years your family were born. You’ll see how many people lived in San Juan in each of those years, and when each of them turned 30.
Argentina · every city · 2025
Where it is
How to read this: San Juan is the dot in colour with a ring around it. The grey dots are the other cities of Argentina in 2025, 77 in all, led by Buenos Aires, 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, San Juan covered 113 km², and buildings, roads and other built-up land covered 34 km² of it. That is 74 m² of built-up land for each person, about a square 9 by 9 metres. Since 1975, its built-up land has grown to 2.2 times its size, and its people are 2.2 times as many.
How to read this: pale is the whole of the city's land; the stronger square inside it is what is actually built on. The three are drawn to the same scale, so a larger square really is more land, and hatching means the year is the UN's projection rather than a count.
Of every 100 people in Argentina
Its share of Argentina
Of every 100 people in Argentina in 2025, 1 lived in San Juan, which is 464,466 people.
How to read this: shrink Argentina to 100 people and this is what you get. The coloured squares are the ones who would live in San Juan; 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
- 1194 Tongxiang China465,450
- 1195 Balia India465,399
- 1196 Manado Indonesia464,793
- 1197 Shanwei China464,738
- 1198 San Juan464,466
- 1199 Meizhou China464,343
- 1200 Bijie China463,837
- 1201 Haldwani India463,530
- 1202 West Valley City United States463,325
In Argentina, 2025
- 541 San Miguel de Tucumán959,565
- 720 La Plata742,952
- 879 Mar del Plata614,979
- 881 Salta613,956
- 1198 San Juan464,466
- 1391 Resistencia406,337
- 1447 Santiago del Estero393,257
- 1451 Corrientes392,082
- 1513 Posadas375,741
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 San Juan 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 San Juan 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