The population of the United Kingdom was estimated at almost 67.6 million people in 2022. It is the 21st most populated country in the world and has a population density of 279 people per square kilometre, with England having significantly greater density than Wales, Scotland, and Northern Ireland. Almost a third of the population lives in south east England, which is predominantly urban and suburban, with about 9 million in the capital city, London, whose population density is just over 5,200 per square kilometre.
A nationwide census, known as Census 2001, was conducted in the United Kingdom on Sunday, 29 April 2001. This was the 20th UK census and recorded a resident population of 58,789,194.
White British is an ethnicity classification used for the indigenous White population identifying as English, Scottish, Welsh, Cornish, Northern Irish, or British in the United Kingdom Census. In the 2011 census, the White British population was 49,997,686, 81.5% of Great Britain's total population. For the United Kingdom entirely, due to different reporting measures within Northern Ireland which includes all those who identified as British with those who identified as Irish, an amalgamated total of 52,320,080 including those who identified as White Irish in Great Britain is given making up 82.8% of the population.
British Nigerians have formed long-established communities in London, Liverpool and other industrial cities. Many Nigerians and their British-born descendants in Britain live in South London, and they are one of the larger immigrant groups in the country.
Germans in the United Kingdom form one of the largest minority groups in the country. Today, there are many Germans living in the United Kingdom, and many Britons or German British have German ancestry, including the British royal family. While those born in Germany constitute one of the UK's largest foreign-born groups, many are British nationals, rather than German nationals, who were born in Germany to British military personnel based there.
Mixed is an ethnic group category that was first introduced by the United Kingdom's Office for National Statistics for the 2001 Census. Colloquially, it refers to British citizens or residents whose parents are of two or more races or ethnic backgrounds. The Mixed or Multiple ethnic group in England and Wales numbered 1.7 million in the 2021 census, 2.9% of the population.
Spaniards in the United Kingdom are people of Spanish descent resident in Britain. They may be British citizens or non-citizen immigrants.
East Asians in the United Kingdom are East Asians living in the United Kingdom. They have been present in the country since the 17th century and primarily originate from countries such as China, Hong Kong, Japan, South Korea and Taiwan. They are called "East Asian" or "Oriental", although – dependent upon the context – the use of the term "Oriental" might be considered by some to be derogatory or offensive. In the 2001 British census, the term Chinese or Other is used.
The term Other White, or White Other, is a classification of ethnicity in the United Kingdom, used in documents such as the 2021 United Kingdom Census, to describe people who identify as white persons who are not of the English, Welsh, Scottish, Roma, Irish or Irish Traveller ethnic groupings. In Scotland, the term Other White is also used to refer collectively to those not of Scottish or Other British ethnicity, in which case it also includes those of a Gypsy, Roma, Irish or Irish Traveller background.
Americans in the United Kingdom or American Britons are emigrants from the United States who are residents or citizens of the United Kingdom.
Kenyan migration to the United Kingdom has been occurring for many decades. As a result, many people in the UK were born in Kenya, or have Kenyan ancestry. Many Kenyan people who migrated to the UK are of South Asian extraction.
British Serbs or Serbs in the United Kingdom are Serbs and people of Serbian ancestry in the United Kingdom.
Romanians in the United Kingdom refers to Romanian immigrants in the United Kingdom, both citizens and non-citizens, along with British citizens of Romanian ancestry. The number of Romanian-born people resident in the UK has risen from 83,168 at the time of the 2011 United Kingdom census to 538,840 in England and Wales alone in 2021.
Czechs in the United Kingdom refers to the phenomenon of Czech people migrating to the United Kingdom from the Czech Republic or from the political entities that preceded it, such as Czechoslovakia. There are some people in the UK who were either born in the Czech lands or have Czech ancestry, some of whom descended from Jewish refugees who arrived during World War II.
Ugandan migration to the United Kingdom refers to the movement of people from Uganda. Today, a small proportion of people in the United Kingdom were either born in Uganda, or have Ugandan ancestry.
Lebanese people in the United Kingdom include people originating from Lebanon who have migrated to the United Kingdom and their descendants.
Since 1922, the United Kingdom has been made up of four countries: England, Scotland, Wales and Northern Ireland. The UK Prime Minister's website has used the phrase "countries within a country" to describe the United Kingdom.
Eritreans in the United Kingdom or Eritrean Britons are an ethnic group that consist of Eritrean immigrants to the United Kingdom as well as their descendants.
Cornwall is a unitary authority and ceremonial county of England in the United Kingdom. At the 2011 census it had a population of 532,000. Cornwall is the homeland of the Cornish people, and many within Cornwall identify with a Cornish ethnic or national identity, although, due to Cornwall's political status as part of England and the United Kingdom, as well as in-migration from other parts of the UK and EU, additional identities such as English, British, and European may also be adopted.
White: Gypsy or Irish Traveller is an ethnicity classification used in the 2011 United Kingdom Census. In the 2011 census, the White: Gypsy or Irish Traveller population was 63,193 or about 0.1 per cent of the total population of the country. The ethnicity category may encompass populace from the distinct ethnic groups of Romanichal Travellers or Irish Travellers, and their respective related subgroupings, who identify as, or are perceived to be, white people in the United Kingdom.
South African-born residents in the United Kingdom: 235,060 – 0.4% 
England and 
Wales: 217,180 – 0.4% (2021) [1] 
Scotland: 15,253 – 0.3% (2022) [2] 
