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Gillingham, 
United Kingdom
258,422 people lived in Gillingham in 2025. It is the 2256th largest of the world's 12,138 cities, and the 28th largest in the United Kingdom.
Like every city on this site, Gillingham 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 Gillingham grew
For every 10 people in Gillingham in 1975, there were 12.6 in 2025.
On the UN's projection it will have 306,176 people in 2050. It passed 250,000 people between 2020 and 2025.
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
Gillingham through your family’s years
Put in the years your family were born. You’ll see how many people lived in Gillingham in each of those years, and when each of them turned 30.
United Kingdom · every city · 2025
Where it is
How to read this: Gillingham is the dot in colour with a ring around it. The grey dots are the other cities of the United Kingdom in 2025, 150 in all, led by London, 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, Gillingham covered 67 km², and buildings, roads and other built-up land covered 16 km² of it. That is 62 m² of built-up land for each person, about a square 8 by 8 metres. Since 1975, its built-up land has grown by 50%, and its people have grown by 26%.
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 Kingdom
Its share of the United Kingdom
Of every 1,000 people in the United Kingdom in 2025, 4 lived in Gillingham, which is 258,422 people.
How to read this: 1,000 squares, one for every 1,000th person in the United Kingdom; the coloured squares live in Gillingham. 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
- 2249 Paarl South Africa259,665
- 2250 Vidisha India259,638
- 2252 Dundo Angola259,341
- 2253 Nawada India259,262
- 2256 Gillingham258,422
- 2257 New Orleans United States258,413
- 2259 Abua Nigeria258,314
- 2260 Masaurhi India258,274
- 2262 Netanya Israel257,714
In the United Kingdom, 2025
- 1783 Hull322,100
- 1877 Wakefield306,684
- 2075 Southend-on-Sea280,158
- 2112 Reading274,632
- 2256 Gillingham258,422
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 Gillingham 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 Gillingham 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