As of mid-2022, the UK's estimated population was 67.5 million (ONS). Breakdown by constituent country:
| Country | Population (mid-2022) | % of UK |
|---|---|---|
| England | 57.1M | 84.6% |
| Scotland | 5.4M | 8.1% |
| Wales | 3.1M | 4.6% |
| Northern Ireland | 1.9M | 2.8% |
ONS principal projection: 70M by 2030, 73M by 2045—driven by migration.
"Great Britain" = England + Scotland + Wales (island). "United Kingdom" = GB + Northern Ireland (political entity).