Chart and table of population level and growth rate for the London, UK metro area from 1950 to 2025.

By 2043 the population of London is expected to reach 9.8 million people, an increase of 550,000 people when compared with 2025. While it has seen quite a steep rise in its population in recent years, London’s population was relatively stable throughout the 1980s and even decreased slightly towards the end of that decade. After peaking at 8.89 million in 2019, the population of London has fallen slightly, to 8.86 million by 2022. UK population forecast Like London, the population of the United Kingdom is forecast to continue to grow well into the middle of the century. By 2046, the population of the UK is estimated to be over 76.3 million people, an increase of over 20 million people when compared with the population figures for 1976. Additionally, the average age of the population is predicted to increase from 39.5 years in 2020 to 44.5 years by the mid-2040s, and continue to increase towards the end of the century. London looms large In the UK, London is by far the largest urban agglomeration in the country, dwarfing the UK's next largest cities of Birmingham, Manchester, and Leeds. London also has a dominant economic position in the UK, with the city accounting for around a quarter of the total GDP in the country. The UK capital also has a far higher GDP per head than the rest of the county, at 57,338 pounds, compared with 33,593 pounds.

Annual population estimates as of July 1st, by census metropolitan area and census agglomeration, single year of age, five-year age group and gender, based on the Standard Geographical Classification (SGC) 2021.

London was by far the largest urban agglomeration in the United Kingdom in 2023, with an estimated population of 9.65 million people, more than three times as large as Manchester, the UK’s second-biggest urban agglomeration. The agglomerations of Birmingham and Leeds / Bradford had the third and fourth-largest populations respectively, while the biggest city in Scotland, Glasgow, was the fifth largest. Largest cities in Europe Two cities in Europe had larger urban areas than London, with the Russian capital Moscow having a population of almost 12.7 million. The city of Paris, located just over 200 miles away from London, was the second-largest city in Europe, with a population of more than 11.2 million people. Paris was followed by London in terms of population-size, and then by the Spanish cities of Madrid and Barcelona, at 6.75 million and 5.68 million people respectively. Russia's second-biggest city; St. Petersburg had a population of 5.56 million, followed by Rome at 4.3 million, and Berlin at 3.5 million. London’s population growth Throughout the 1980s, the population of London fluctuated from a high of 6.81 million people in 1981 to a low of 6.73 million inhabitants in 1988. During the 1990s, the population of London increased once again, growing from 6.8 million at the start of the decade to 7.15 million by 1999. London's population has continued to grow since the turn of the century, reaching a peak of 8.96 million people in 2019, and is forecast to reach 9.8 million by 2043.

Number and rate (per 100,000 population) of homicide victims, Canada and Census Metropolitan Areas, 1981 to 2023.

The population of the United Kingdom in 2023 was estimated to be approximately 68.3 million in 2023, with almost 9.48 million people living in South East England. London had the next highest population, at over 8.9 million people, followed by the North West England at 7.6 million. With the UK's population generally concentrated in England, most English regions have larger populations than the constituent countries of Scotland, Wales, and Northern Ireland, which had populations of 5.5 million, 3.16 million, and 1.92 million respectively. English counties and cities The United Kingdom is a patchwork of various regional units, within England the largest of these are the regions shown here, which show how London, along with the rest of South East England had around 18 million people living there in this year. The next significant regional units in England are the 47 metropolitan and ceremonial counties. After London, the metropolitan counties of the West Midlands, Greater Manchester, and West Yorkshire were the biggest of these counties, due to covering the large urban areas of Birmingham, Manchester, and Leeds respectively. Regional divisions in Scotland, Wales and Northern Ireland The smaller countries that comprise the United Kingdom each have different local subdivisions. Within Scotland these are called council areas whereas in Wales the main regional units are called unitary authorities. Scotland's largest Council Area by population is that of Glasgow City at over 622,000, while in Wales, it was the Cardiff Unitary Authority at around 372,000. Northern Ireland, on the other hand, has eleven local government districts, the largest of which is Belfast with a population of around 348,000.

In 2023, the population of the United Kingdom reached 68.3 million, compared with 67.6 million in 2022. The UK population has more than doubled since 1871 when just under 31.5 million lived in the UK and has grown by around 8.2 million since the start of the twenty-first century. For most of the twentieth century, the UK population steadily increased, with two noticeable drops in population occurring during World War One (1914-1918) and in World War Two (1939-1945). Demographic trends in postwar Britain After World War Two, Britain and many other countries in the Western world experienced a 'baby boom,' with a postwar peak of 1.02 million live births in 1947. Although the number of births fell between 1948 and 1955, they increased again between the mid-1950s and mid-1960s, with more than one million people born in 1964. Since 1964, however, the UK birth rate has fallen from 18.8 births per 1,000 people to a low of just 10.2 in 2020. As a result, the UK population has gotten significantly older, with the country's median age increasing from 37.9 years in 2001 to 40.7 years in 2022. What are the most populated areas of the UK? The vast majority of people in the UK live in England, which had a population of 57.7 million people in 2023. By comparison, Scotland, Wales, and Northern Ireland had populations of 5.44 million, 3.13 million, and 1.9 million, respectively. Within England, South East England had the largest population, at over 9.38 million, followed by the UK's vast capital city of London, at 8.8 million. London is far larger than any other UK city in terms of urban agglomeration, with just four other cities; Manchester, Birmingham, Leeds, and Glasgow, boasting populations that exceed one million people.

In 2025, Moscow was the largest city in Europe with an estimated urban agglomeration of 12.74 million people. The French capital, Paris, was the second largest city in 2025 at 11.35 million, followed by the capitals of the United Kingdom and Spain, with London at 9.84 million and Madrid at 6.81 million people. Istanbul, which would otherwise be the largest city in Europe in 2025, is excluded as it is only partially in Europe, with a sizeable part of its population living in Asia. Europe’s population is almost 750 million Since 1950, the population of Europe has increased by approximately 200 million people, increasing from 550 million to 750 million in these seventy years. Before the turn of the millennium, Europe was the second-most populated continent, before it was overtaken by Africa, which saw its population increase from 228 million in 1950 to 817 million by 2000. Asia has consistently had the largest population of the world’s continents and was estimated to have a population of 4.6 billion. Europe’s largest countries Including its territory in Asia, Russia is by far the largest country in the world, with a territory of around 17 million square kilometers, almost double that of the next largest country, Canada. Within Europe, Russia also has the continent's largest population at 145 million, followed by Germany at 83 million and the United Kingdom at almost 68 million. By contrast, Europe is also home to various micro-states such as San Marino, which has a population of just 30 thousand.

In 2023, there were estimated to have been 82 acid attacks in London, compared with 97 in 2022. Within a few years, the number of acid attacks in London increased from just 78 in 2012 to 471 in 2017, before gradually falling in the years since. Although overall crime in London has also risen in a similar time period, this type of attack has grown at a far more rapid rate. Most acid attacks in 2017 were committed by young men against other young men, while many of the targets were people riding mopeds. Links with moped crime The targeting of moped drivers by acid attacks was one of the main features of the acid attack crime wave in the late 2010s. One of the established patterns was to incapacitate the driver with corrosive fluid, and then steal the moped, which was hen often used to commit further crimes. The number of crimes committed by people riding a moped in London grew at a very similar rate to acid attacks, reaching 23,909 offences in 2017, compared with just over 1,000 in 2014. Although both these specific types of crimes have declined in the UK capital, violent crime more broadly has remained high. Violent crime in the capital The number of violent crimes reported in London reached a recent peak of over 242,800 offences in 2021/22, declining only slightly in 2022/23. There has, however, been a slight decline in homicides in the UK capital, with offences falling from 159 in 2017/18, to 112 by 2022/23. Although this was by far the most homicides of any police force area in England and Wales, when adjusted for population size, London's homicide rate was lower than eleven other areas.

In the Brexit referendum of 2016, almost three quarters of people who lived in Edinburgh voted to remain in the European Union. Several other major cities also had a majority of remain voters, including the English cities of London, Manchester, Liverpool, Newcastle and Leeds. In the UK’s second-largest city, Birmingham, a slight majority of people voted to leave the European Union. Across the whole of the United Kingdom, the leave side was victorious after winning the votes of 17.4 million people. Perceptions on Brexit in 2025 Since the UK left the EU in 2020, the share of people who regret Brexit has been steadily increasing. As of January 2025, 55 percent of people in Great Britain thought that Brexit was the wrong decision, compared with 30 percent who still supported the decision. Furthermore, a survey from the same month suggested that people thought Brexit had reaped few benefits. Approximately 67 percent of those surveyed thought that it had negatively impacted the cost of living, and 65 percent believing it had diminished the UK economy as a whole. By contrast, the main positive impact of Brexit was seen as the UK's control over its own laws. Demographics of Brexit voters Although several major English cities supported the UK remaining in the EU, every English region, with the exception of Greater London, voted for Brexit. While Wales also supported leave, both Scotland and Northern Ireland had a majority who supported remain. There were also noticeable divisions across age groups, with younger voters typically more likely to vote against Brexit, compared with older ones who supported it. Almost three-quarter of 18 to 24-year-olds voted Remain, compared with 60 percent of those aged 65 or over who backed Leave.