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Nam Định, 
Vietnam
353,044 people lived in Nam Định in 2025. It is the 1620th largest of the world's 12,138 cities, and the 13th largest in Vietnam.
That figure counts the whole built-up area, not the area Nam Định 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 Nam Định grew
Where Nam Định had 10 people in 1975, it had 23.7 in 2025.
On the UN's projection it will have 338,355 people in 2050. It passed 250,000 people between 2005 and 2010.
projected (after 2025) · how sure the UN is: high moderate low
How to read this: each column is one of the UN's five-yearly estimates, 1975 through 2050, and taller means more people. Where a column is hatched the year has not happened yet. The strip under the columns is the UN's own confidence in each figure, palest where it is least sure; where it is blank the city was not on the list at all.
People · your family's years · 1975 to 2050
Nam Định through your family’s years
Put in the years your family were born. You’ll see how many people lived in Nam Định in each of those years, and when each of them turned 30.
Vietnam · every city · 2025
Where it is
How to read this: Nam Định is the dot in colour with a ring around it. The grey dots are the other cities of Vietnam in 2025, 137 in all, led by Ho Chi Minh 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, Nam Định covered 98 km², and buildings, roads and other built-up land covered 15 km² of it. That is 43 m² of built-up land for each person, about a square 7 by 7 metres. Since 1975, its built-up land has grown to 5.6 times its size, and its people are 2.4 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 Vietnam
Its share of Vietnam
Of every 1,000 people in Vietnam in 2025, 3 lived in Nam Định, which is 353,044 people.
How to read this: shrink Vietnam to 1,000 people and this is what you get. The coloured squares are the ones who would live in Nam Định; 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
- 1616 Bilbeis Egypt353,541
- 1617 Haifeng China353,473
- 1618 Oak Ridge United States353,212
- 1619 Kurukshetra India353,119
- 1620 Nam Định353,044
- 1621 Siem Reap Cambodia352,948
- 1622 Utsunomiya Japan352,816
- 1623 Khurja India352,785
- 1624 Skopje North Macedonia352,624
In Vietnam, 2025
- 1111 Vũng Tàu498,010
- 1273 Tây Ninh437,816
- 1384 Huế408,692
- 1602 Vinh355,643
- 1620 Nam Định353,044
- 1776 Hải Dương323,442
- 1792 Quảng Ngãi320,907
- 1814 Buôn Ma Thuột316,052
- 1944 Quy Nhơn297,184
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 Nam Định 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 Nam Định 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