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ONS coding system

The ONS coding system was a hierarchical code used in the United Kingdom for tabulating census and other statistical data. ONS refers to the Office for National Statistics.

It was replaced by the GSS coding system on 1 January 2011.

Code formulation

Principal authorities

The code was constructed top down from a four character code representing a unitary authority or two-tier county and district.

00EC Middlesbrough (unitary)
or
12 Cambridgeshire county
12UB Cambridge district

Electoral wards and output areas

Local government wards had a two-letter code within their local authority, and census output area an additional four digits within a ward.

12UB Cambridge district
12UBGA Petersfield ward
12UBGA0001 Output area: Gwydir Street (north of junction with Hooper St)

The authority and ward codes were recognised by Eurostat as local administrative unit code levels 1 and 2 within the NUTS system.

Civil parishes

An overlapping system encoded civil parish areas. Parishes were represented by an additional three digits within their local authority:

12UD Fenland district
12UD010 Tydd St. Giles parish

List of codes for counties and districts

The codes for counties and districts were as follows.[1]

Also showing NUTS(3) codes thus: (UKH12)

Greater London

These codes became active following local government changes in 1986.

Metropolitan counties

These codes became active following local government changes in 1986.

Non-hierarchical codes for Greater London and metropolitan counties

Unitary authorities established in the 1990s

These codes became active following local government changes the 1990s.

Unitary authorities established in 2009

These codes became active following local government changes in 2009.

  • 00KB   Bedford
  • 00KC   Central Bedfordshire
  • 00EQ   Cheshire East
  • 00EW   Cheshire West and Chester
  • 00HE   Cornwall
  • 00HF   Isles of Scilly
  • 00EJ   County Durham
  • 00EM   Northumberland
  • 00GG   Shropshire
  • 00HY   Wiltshire

Non-metropolitan counties

Wales

These codes became active following local government changes in 1996.

Scotland

These codes became active following local government changes in 1996.

Northern Ireland

References

  1. ^ "District Names and Codes for England and Wales as at 31/12/1994". statistics.gov.uk. Archived from the original on 4 June 2011. Retrieved 4 November 2023.
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