Countries of the United Kingdom by population
The population of the countries in Britain and regions of the United Kingdom was last measured by census in 2011, and the Census organisations have produced population estimates for subsequent years by updating the census results with estimates of births, deaths and migration in each year. The census results, and the annual population estimates, summarised below show that England is by far the most populous country of the United Kingdom and its population is therefore also presented by region.
Population UK, Countries and Regions June 2019
| Rank | Name | Population | Percent of UK | Area | Pop.density | Population |
| 1 | England ∟ London ∟ South East ∟ East of England ∟ South West ∟ North West ∟ East Midlands ∟ West Midlands ∟ Yorkshire and the Humber ∟ North East | 56,286,961 8,961,989 9,180,135 6,236,072 5,624,696 7,341,196 4,835,928 5,934,037 5,502,967 2,669,941 | 84.3% 13.4% 13.7% 9.3% 8.4% 11.0% 7.2% 8.9% 8.2% 4.0% | 130,395 km² 1,572 km² 19,095 km² 19,120 km² 23,829 km² 14,165 km² 15,627 km² 13,000 km² 15,420 km² 8,592 km² | 406.55/km² 5199.71/km² 452.20/km² 305.80/km² 221.95/km² 497.86/km² 302.24/km² 430.00/km² 342.65/km² 290.09/km² | 53,107,169 8,204,407 8,652,704 5,862,418 5,300,831 7,055,961 4,537,448 5,608,668 5,288,212 2,596,441 |
| 2 | Scotland | 5,463,300 | 8.2% | 78,772 km² | 67.22/km² | 5,299,900 |
| 3 | Wales | 3,152,879 | 4.7% | 20,779 km² | 147.43/km² | 3,063,758 |
| 4 | Northern Ireland | 1,893,667 | 2.8% | 13,843 km² | 130.81/km² | 1,814,318 |
| United Kingdom | 66,796,807 | 100% | 243,789 km² | 259.16/km² | 63,285,145 |