ONS coding systemThe 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 formulationPrincipal authoritiesThe code was constructed top down from a four character code representing a unitary authority or two-tier county and district.
Electoral wards and output areasLocal government wards had a two-letter code within their local authority, and census output area an additional four digits within a ward.
The authority and ward codes were recognised by Eurostat as local administrative unit code levels 1 and 2 within the NUTS system. Civil parishesAn overlapping system encoded civil parish areas. Parishes were represented by an additional three digits within their local authority:
List of codes for counties and districtsThe codes for counties and districts were as follows.[1] Also showing NUTS(3) codes thus: Greater LondonThese codes became active following local government changes in 1986.
Metropolitan countiesThese codes became active following local government changes in 1986.
Non-hierarchical codes for Greater London and metropolitan counties
Unitary authorities established in the 1990sThese codes became active following local government changes the 1990s.
Unitary authorities established in 2009These codes became active following local government changes in 2009.
Non-metropolitan counties
WalesThese codes became active following local government changes in 1996.
ScotlandThese codes became active following local government changes in 1996.
Northern Ireland
References
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