<P> According to the 2011 census, the total population of the United Kingdom was around 63,182,000 . It is the 22nd most populated country in the world . Its overall population density is 259 people per square kilometre (671 people per sq mi), with England having a significantly higher population density than Wales, Scotland and Northern Ireland . Almost one - third of the population lives in England's southeast, which is predominantly urban and suburban, with about 9 million in the capital city of London, the population density of which is just over 5,200 per square kilometre (13,468 per sq mi). </P> <P> The population of the United Kingdom is considered an example of a population that has undergone the' demographic transition'--that is, the transition from a (typically) pre-industrial population with high birth and mortality rates and only slow population growth, through a stage of falling mortality and faster rates of population growth, to a stage of low birth and mortality rates with, again, lower rates of population growth . This population growth through' natural change' has been accompanied in the past two decades by growth through net international migration into the UK . </P>

What is the current population of the uk