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Riverside, 
United States
367,336 people lived in Riverside in 2025. It is the 1557th largest of the world's 12,138 cities, and the 52nd largest in the United States.
Like every city on this site, Riverside is counted as a built-up area seen from above rather than as a city government's territory. Why that changes the number.
Verified 2026-09-30 · 73 canaries
People · every five years · 1975 to 2050
How Riverside grew
Count 10 people in Riverside in 2000 and the same count gives 67.7 in 2025.
On the UN's projection it will have 513,343 people in 2050. It passed 250,000 people between 2010 and 2015. The UN first counts it as a city in 2000, when it passed 50,000 people.
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
Riverside through your family’s years
Put in the years your family were born. You’ll see how many people lived in Riverside in each of those years, and when each of them turned 30.
United States · every city · 2025
Where it is
How to read this: every dot is one of the 348 cities in the United States in 2025, and a dot's area is how many people live there, the biggest being New York City. The ringed dot in colour is Riverside; 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, Riverside covered 130 km², and buildings, roads and other built-up land covered 37 km² of it. That is 101 m² of built-up land for each person, about a square 10 by 10 metres. Since 2000, its built-up land has grown to 4.9 times its size, and its people are 6.8 times as many.
How to read this: the outer pale square stands for all the land the city covers, and the solid square inside it for the part with buildings, roads and the like on it. All three squares share a scale, so you can compare them by eye. A hatched one is a year the UN has projected.
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, 1 lived in Riverside, which is 367,336 people.
How to read this: 1,000 squares stand for everyone in the United States, one square for every 1,000th person. Count the coloured ones and you have Riverside's share; the grey remainder live somewhere else in the country.
Ranked by people · 2025
Cities of a similar size
In the world, 2025
- 1553 Plano367,716
- 1554 Godhra India367,633
- 1555 Xianyou China367,523
- 1556 Gboko Nigeria367,407
- 1557 Riverside367,336
- 1558 Granada Spain367,226
- 1559 Gonaïves Haiti367,158
- 1560 Santa Fe Argentina366,960
- 1561 Ratlam India366,958
In the United States, 2025
- 1419 Stockton398,470
- 1436 Colorado Springs394,888
- 1475 Pittsburgh385,498
- 1553 Plano367,716
- 1557 Riverside367,336
- 1569 Mission Viejo365,221
- 1597 Memphis356,215
- 1606 McAllen355,331
- 1618 Oak Ridge353,212
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 Riverside are the UN's own, at five-year steps: an estimate for each of 2000 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 Riverside 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