The English region with the largest population increase was the East of England, which grew by around 8.3% or 488,000 more residents. The English region with the smallest increase was the North East, growing by 1.9% or around 50,000 people. In Wales, the population grew by 1.4% or 44,000 people.
A map shows the English regions and Wales.
In Welwyn Hatfield, the population size has increased by 8.5%, from around 110,500 in 2011 to 119,900 in 2021. This is higher than the overall increase for England (6.6%), where the population grew by nearly 3.5 million to 56,489,800.
A map of local authority areas in England is coloured to indicate the percentage change in population of each area. The data used in this article are available to download at the end.
Nearby areas like East Hertfordshire and Hertsmere have seen their populations increase by around 9.0% and 7.8%, respectively, while others such as St Albans saw an increase of 5.4% and North Hertfordshire saw smaller growth (4.8%).
The map then zooms to centre on Welwyn Hatfield and show neighbouring areas.
At the other end of the scale, North Norfolk has seen an increase of just 1.5%.
The local authority areas displayed on the map change form and position to create a bar chart that orders selected areas of the East of England by percentage change in total population.
At 8.5%, Welwyn Hatfield's population increase is slightly higher than the increase for the East of England (8.3%).
Welwyn Hatfield is highlighted on the bar chart along with other local authority areas in the East of England.
Every local authority area of England is shown as a dot on a chart, with the legend running from the largest percentage decrease to the highest percentage increase in population. Welwyn Hatfield is highlighted.
Some local authority areas have seen their populations decline. Kensington and Chelsea had an estimated population of 143,400 in 2021, which was around 15,200 fewer than in 2011 and a decrease of 9.6%.
The chart continues to show all areas of England as dots, ordered by the percentage change in total population, with the largest decreases towards the left and the largest increases towards the right.
The total population of local authority areas varies a lot, from Birmingham with around 1,144,900 people to the Isles of Scilly with around 2,100 people. The sizes of these circles are proportionate to the size of the population in each local authority area.
The chart changes into circles located at the centre of each local authority area on a map. The area of each circle indicates the total population.
As of 2021, Welwyn Hatfield is the 15th most densely populated of the East of England's 45 local authority areas, with around seven people living on each football pitch-sized area of land.
A drawing of a football pitch is displayed. The number of people on the pitch, or the number of pitches for one person, changes as described in the text content.
At the other end of the population density scale for England, the amount of land in Eden in Cumbria works out at around five pitches per resident.
This population pyramid shows the population of males and females in each five-year age group at the time of the 2011 Census.
The largest age group in the East of England back then was those aged 45 to 49 years.
A population pyramid is displayed. It shows males and females in each age group as a percentage of the total population for Welwyn Hatfield in 2011. The age group with the largest number of people is highlighted.
More recently, in 2021, the largest age group in the East of England was those aged 50 to 54 years.
A population pyramid is displayed. It shows the number males and females in each age group as a percentage of the total population for the East of England in 2021. The age group with the largest number of people is highlighted.
In England, the largest age group in 2021 was people aged 30 to 34 years.
The population pyramid changes to show the number of males and females in each age group as a percentage of the total population in England. The age group with the largest number of people is highlighted.
Overall, in England, there has been an increase of 20.1% in people aged 65 years and over, an increase of 3.6% in people aged 15 to 64 years, and an increase of 5.0% in children aged under 15 years.
The population pyramid turns into a horizontal bar chart, with bars representing the percentage change in the number of people of any sex in each five-year age group in England.
This is how Welwyn Hatfield compares. There has been an increase of 11.6% in people aged 65 years and over, an increase of 7.2% in people aged 15 to 64 years, and an increase of 11.2% in children aged under 15 years.
The horizontal bar chart now shows the percentage change in the number of people of any sex in each five-year age group in Welwyn Hatfield.
A map of England appears, highlighting the areas with the largest increases in people aged 65 years and over.
The places that have seen the largest increases in the population aged under 15 years are Dartford in Kent, where the size of this age group increased by 31.8% between 2011 and 2021, and Peterborough in the East of England (23.8%).
The map now highlights the areas with the largest increases in children aged under 15 years.
The places that have seen the largest percentage decrease in the number of children aged under 15 years are Westminster (19.4%) and Kensington and Chelsea (17.8%) in London and Richmondshire in Yorkshire (12.3%).
The map now highlights the areas with the largest decreases in children aged under 15 years.
Population change in certain areas may reflect how the coronavirus
(COVID-19) pandemic affected people's choice of usual residence on Census
Day, for example, students and in some urban areas.
These changes might have been temporary for some and more long-lasting for others.
First results from Census 2021 are rounded to the nearest 100 so may not add exactly.
Changes over time have been calculated with rounded estimates for Census 2021 and unrounded estimates from the 2011 Census.
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