| a | | Projected est. (medium fertility variant). |
| b | | Excludes some Overseas Territories. |
| c | | Excluding Channel Islands (Guernsey and Jersey) and Isle of Man, shown separately, if available. |
| d | | 2023 |
| e | | Data refer to "Urban area" (Greater London). |
| f | | 2019 |
| g | | 2024 |
| h | | Exc. irrigation canals and landscaping care. |
| i | | Data classified according to ISIC Rev. 4. |
| j | | Exc. publishing activities. Inc. irrigation canals. |
| k | | Inc. publishing activities and landscape care. Exc. repair of personal and household goods. |
| l | | Estimate. |
| m | | Calculated by the UN Statistics Division from national indices. |
| n | | Data refers to a 5-year period preceding the reference year. |
| o | | Calculated by the UN Statistics Division. |
| p | | For statistical purposes, the foreign-born population includes persons born in some Overseas Territories. |
| q | | Including refugees. |
| r | | As of mid-2024, the total number of individuals recognised under UK’s statelessness determination procedure is 394. |
| s | | 2022 |
| t | | England and Wales only. |
| u | | 2021 |
| v | | Data at 1 January of the reporting year. |
| w | | Population aged 16 years and over. |
| x | | Provisional data. |
| y | | Shipments of coal and oil to the Channel Islands and the Isle of Man from the United Kingdom are not classed as exports but as part of UK supply |
| z | | Development Assistance Committee member (OECD). |