Migrant Indicator

Summary

This dataset provides Census 2021 estimates that classify usual residents aged one year and over in England and Wales by their address one year ago, in order to determine their status as a migrant from within or outside the UK. The estimates are as at Census Day, 21 March 2021.

Variable and dataset information

Area type

Census 2021 statistics are published for a number of different geographies. These can be large, for example the whole of England, or small, for example an output area (OA), the lowest level of geography for which statistics are produced.

For higher levels of geography, more detailed statistics can be produced. When a lower level of geography is used, such as output areas (which have a minimum of 100 persons), the statistics produced have less detail. This is to protect the confidentiality of people and ensure that individuals or their characteristics cannot be identified.

Lower tier local authorities

Lower tier local authorities provide a range of local services. There are 309 lower tier local authorities in England made up of 181 non-metropolitan districts, 59 unitary authorities, 36 metropolitan districts and 33 London boroughs (including City of London). In Wales there are 22 local authorities made up of 22 unitary authorities.

Coverage

Census 2021 statistics are published for the whole of England and Wales. However, you can choose to filter areas by:

  • country - for example, Wales
  • region - for example, London
  • local authority - for example, Cornwall
  • health area – for example, Clinical Commissioning Group
  • statistical area - for example, MSOA or LSOA

Migrant indicator

The migration indicator classifies people based on the difference between their current address and their address one year ago. It provides an indicator of the movement of people within the UK and from outside the UK, in the one-year period before the census.

Variables

Population type
All usual residents
Area type
Lower tier local authorities
Coverage
England and Wales
Migrant indicator
5 Categories
  • Address one year ago is the same as the address of enumeration
  • Address one year ago is student term-time or boarding school address in the UK
  • Migrant from within the UK: Address one year ago was in the UK
  • Migrant from outside the UK: Address one year ago was outside the UK
  • Does not apply

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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

Read more in Section 5 of our article Design for Census 2021.

Version history

Release date Reason for update
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Version superseded
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