- On census day, 27 March 2011, the population of the United Kingdom (UK) was 63.2 million; the largest it had ever been.
- The population of the UK increased by 4.1 million (nearly 7 per cent) between 2001 and 2011.
- The population of England was 53.0 million people, 5.3 million people in Scotland, 3.1 million people in Wales and 1.8 million people in Northern Ireland.
- The median age for females in the UK was 40 years, the same as for England. In Northern Ireland the median age was 38 years, whereas in Scotland and Wales it was 42 years.
- The median age for males in the UK was 38 years, the same as for England. In Northern Ireland the median age was 36 years, whereas in Scotland and Wales it was 40 years.
- In 2011, 65 per cent (40.9 million) of the population of the UK were of working age (16 to 64 years).
- Those aged 65 and over accounted for 16 per cent (10.4 million) of the population of the UK.
- The proportion of the population of the UK who were children (0 to 15 years) was 19 per cent (11.9 million).