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Cities · Puerto Rico · capital
San Juan, 
Puerto Rico
681,030 people lived in San Juan in 2025. It is the 793rd largest of the world's 12,138 cities, and the largest in Puerto Rico, where it is the capital.
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
Count 10 people in San Juan in 1975 and the same count gives 19.8 in 2025.
On the UN's projection it will have 531,956 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
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.
Puerto Rico · every city · 2025
Where it is
How to read this: every dot is one of the 4 cities in Puerto Rico in 2025, and a dot's area is how many people live there. The ringed dot in colour is San Juan; the grey dots are the rest. The outlines around them are neighbouring countries.
Area and built-up land · km²
How much land it covers
In 2025, San Juan covered 244 km², and buildings, roads and other built-up land covered 74 km² of it. That is 108 m² of built-up land for each person, about a square 10 by 10 metres. Since 1975, its built-up land has grown by 61%, and its people are 2 times as many.
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 Puerto Rico
Its share of Puerto Rico
Of every 100 people in Puerto Rico in 2025, 21 lived in San Juan, which is 681,030 people.
How to read this: 100 squares, one for every 100th person in Puerto Rico; the coloured squares live in San Juan. 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
- 789 Vapi India682,459
- 790 Florianópolis Brazil682,065
- 791 Longgang China681,306
- 792 Santiago de los Caballeros Dominican Republic681,087
- 793 San Juan681,030
- 794 Youyi China680,993
- 795 Jamnagar India680,589
- 796 Winnipeg Canada679,037
- 797 Garoua Cameroon678,769
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