England's population in 2011 was 53 million, representing some 84% of the UK total. It is one of the most densely populated countries in the world, with 420 people resident per square kilometre in mid-2015, with a particular concentration in London and the south-east. The 2011 census put Scotland's population at 5.3 million, Wales at 3.06 million and Northern Ireland at 1.81 million.