The unstable nature of UK geography means that changes to area names and codes are a regular occurrence. Care must therefore be taken to ensure that the correct names and codes are used for data processing and dissemination. ONS Geography supports this with three names and codes products; click on the text in the appropriate coloured box for more details:
| Area Names & Codes Files |
Individual files containing definitive names and codes of all administrative areas, health areas, electoral areas, NUTS areas and various other geographies. |
| Standard Names and Codes (SNAC) |
Single annual product containing definitive names and codes for a range of UK geographies; also alternative administrative area names and codes used by other government departments. |
| Ward History Database |
A history of all electoral wards/divisions in England and Wales since the 1991 Census. |
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