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Oak Ridge, 
United States
353,212 people lived in Oak Ridge in 2025. It is the 1618th largest of the world's 12,138 cities, and the 56th largest in the United States.
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 Oak Ridge grew
For every 10 people in Oak Ridge in 2005, there were 28.7 in 2025.
On the UN's projection it will have 515,185 people in 2050. It passed 250,000 people between 2010 and 2015. The UN first counts it as a city in 2005, when it passed 50,000 people.
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
Oak Ridge through your family’s years
Put in the years your family were born. You’ll see how many people lived in Oak Ridge in each of those years, and when each of them turned 30.
United States · every city · 2025
Where it is
How to read this: Oak Ridge 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, Oak Ridge covered 161 km², and buildings, roads and other built-up land covered 35 km² of it. That is 98 m² of built-up land for each person, about a square 10 by 10 metres. Since 2005, its built-up land has grown to 2.9 times its size, and its people are 2.9 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 Oak Ridge, which is 353,212 people.
How to read this: shrink the United States to 1,000 people and this is what you get. The coloured squares are the ones who would live in Oak Ridge; 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
- 1614 Burewala Pakistan354,057
- 1615 Kafr Al-Zaiyat Egypt354,037
- 1616 Bilbeis Egypt353,541
- 1617 Haifeng China353,473
- 1618 Oak Ridge353,212
- 1619 Kurukshetra India353,119
- 1620 Nam Định Vietnam353,044
- 1621 Siem Reap Cambodia352,948
- 1622 Utsunomiya Japan352,816
In the United States, 2025
- 1557 Riverside367,336
- 1569 Mission Viejo365,221
- 1597 Memphis356,215
- 1606 McAllen355,331
- 1618 Oak Ridge353,212
- 1663 Kansas City344,125
- 1779 Buffalo322,892
- 1780 Parma322,420
- 1843 Arlington311,130
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 Oak Ridge are the UN's own, at five-year steps: an estimate for each of 2005 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 Oak Ridge 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