2021 Census Bulk Data Download
Bulk data products package all the data from a 2021 Census dataset as a single zip file. Each zip file contains separate CSV files for each geographic type (OA, LSOA, MSOA etc).
The first row of the CSV file contains the column headings with data following on row 2 onwards. Each data row contains the values for a single geographic area.
There are two zip files for each dataset:
- The first contains data for the geographies in the original release: output areas, super output areas, local authorities, regions and countries.
- The second contains the extra geographies added after the original release. As of 30 Jan 2023 these geographies are: 2021 wards. Other geographies will be added as they are released.
Protecting personal data
Sometimes we need to make changes to data if it is possible to identify individuals. This is known as statistical disclosure control. In Census 2021, we:
- Swapped records (targeted record swapping), for example, if a household was likely to be identified in datasets because it has unusual characteristics, we swapped the record with a similar one from a nearby small area. Very unusual households could be swapped with one in a nearby local authority.
- Added small changes to some counts (cell key perturbation), for example, we might change a count of four to a three or a five. This might make small differences between tables depending on how the data are broken down when we applied perturbation.