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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.

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.

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:

List of codes for counties and districts

The codes for counties and districts were as follows.

Also showing NUTS(3) codes thus: <code>(UKH12)</code>

Greater London

These codes became active following local government changes in 1986.

  • <code>00AA (UKI11)</code>&nbsp;&nbsp;&nbsp;City of London
  • <code>00AB (UKI21)</code>&nbsp;&nbsp;&nbsp;Barking and Dagenham
  • <code>00AC (UKI23)</code>&nbsp;&nbsp;&nbsp;Barnet
  • <code>00AD (UKI21)</code>&nbsp;&nbsp;&nbsp;Bexley
  • <code>00AE (UKI23)</code>&nbsp;&nbsp;&nbsp;Brent
  • <code>00AF (UKI22)</code>&nbsp;&nbsp;&nbsp;Bromley
  • <code>00AG (UKI11)</code>&nbsp;&nbsp;&nbsp;Camden
  • <code>00AH (UKI22)</code>&nbsp;&nbsp;&nbsp;Croydon
  • <code>00AJ (UKI23)</code>&nbsp;&nbsp;&nbsp;Ealing
  • <code>00AK (UKI21)</code>&nbsp;&nbsp;&nbsp;Enfield
  • <code>00AL (UKI21)</code>&nbsp;&nbsp;&nbsp;Greenwich
  • <code>00AM (UKI12)</code>&nbsp;&nbsp;&nbsp;Hackney
  • <code>00AN (UKI11)</code>&nbsp;&nbsp;&nbsp;Hammersmith and Fulham
  • <code>00AP (UKI12)</code>&nbsp;&nbsp;&nbsp;Haringey
  • <code>00AQ (UKI23)</code>&nbsp;&nbsp;&nbsp;Harrow
  • <code>00AR (UKI21)</code>&nbsp;&nbsp;&nbsp;Havering
  • <code>00AS (UKI23)</code>&nbsp;&nbsp;&nbsp;Hillingdon
  • <code>00AT (UKI23)</code>&nbsp;&nbsp;&nbsp;Hounslow
  • <code>00AU (UKI12)</code>&nbsp;&nbsp;&nbsp;Islington
  • <code>00AW (UKI11)</code>&nbsp;&nbsp;&nbsp;Kensington and Chelsea
  • <code>00AX (UKI22)</code>&nbsp;&nbsp;&nbsp;Kingston upon Thames
  • <code>00AY (UKI12)</code>&nbsp;&nbsp;&nbsp;Lambeth
  • <code>00AZ (UKI12)</code>&nbsp;&nbsp;&nbsp;Lewisham
  • <code>00BA (UKI22)</code>&nbsp;&nbsp;&nbsp;Merton
  • <code>00BB (UKI12)</code>&nbsp;&nbsp;&nbsp;Newham
  • <code>00BC (UKI21)</code>&nbsp;&nbsp;&nbsp;Redbridge
  • <code>00BD (UKI23)</code>&nbsp;&nbsp;&nbsp;Richmond upon Thames
  • <code>00BE (UKI12)</code>&nbsp;&nbsp;&nbsp;Southwark
  • <code>00BF (UKI22)</code>&nbsp;&nbsp;&nbsp;Sutton
  • <code>00BG (UKI12)</code>&nbsp;&nbsp;&nbsp;Tower Hamlets
  • <code>00BH (UKI21)</code>&nbsp;&nbsp;&nbsp;Waltham Forest
  • <code>00BJ (UKI11)</code>&nbsp;&nbsp;&nbsp;Wandsworth
  • <code>00BK (UKI11)</code>&nbsp;&nbsp;&nbsp;Westminster

Metropolitan counties

These codes became active following local government changes in 1986.

  • Greater Manchester districts
  • <code>00BL (UKD32)</code>&nbsp;&nbsp;&nbsp;Bolton
  • <code>00BM (UKD32)</code>&nbsp;&nbsp;&nbsp;Bury
  • <code>00BN (UKD31)</code>&nbsp;&nbsp;&nbsp;Manchester
  • <code>00BP (UKD32)</code>&nbsp;&nbsp;&nbsp;Oldham
  • <code>00BQ (UKD32)</code>&nbsp;&nbsp;&nbsp;Rochdale
  • <code>00BR (UKD31)</code>&nbsp;&nbsp;&nbsp;Salford
  • <code>00BS (UKD31)</code>&nbsp;&nbsp;&nbsp;Stockport
  • <code>00BT (UKD31)</code>&nbsp;&nbsp;&nbsp;Tameside
  • <code>00BU (UKD31)</code>&nbsp;&nbsp;&nbsp;Trafford
  • <code>00BW (UKD32)</code>&nbsp;&nbsp;&nbsp;Wigan
  • Merseyside districts
  • <code>00BX (UKD51)</code>&nbsp;&nbsp;&nbsp;Knowsley
  • <code>00BY (UKD52)</code>&nbsp;&nbsp;&nbsp;Liverpool
  • <code>00BZ (UKD51)</code>&nbsp;&nbsp;&nbsp;St Helens
  • <code>00CA (UKD53)</code>&nbsp;&nbsp;&nbsp;Sefton
  • <code>00CB (UKD54)</code>&nbsp;&nbsp;&nbsp;Wirral
  • South Yorkshire districts
  • <code>00CC (UKE31)</code>&nbsp;&nbsp;&nbsp;Barnsley
  • <code>00CE (UKE31)</code>&nbsp;&nbsp;&nbsp;Doncaster
  • <code>00CF (UKE31)</code>&nbsp;&nbsp;&nbsp;Rotherham
  • <code>00CG (UKE32)</code>&nbsp;&nbsp;&nbsp;Sheffield
  • Tyne and Wear districts
  • <code>00CH (UKC22)</code>&nbsp;&nbsp;&nbsp;Gateshead
  • <code>00CJ (UKC22)</code>&nbsp;&nbsp;&nbsp;Newcastle-upon-Tyne
  • <code>00CK (UKC22)</code>&nbsp;&nbsp;&nbsp;North Tyneside
  • <code>00CL (UKC22)</code>&nbsp;&nbsp;&nbsp;South Tyneside
  • <code>00CM (UKC23)</code>&nbsp;&nbsp;&nbsp;Sunderland
  • West Midlands districts
  • <code>00CN (UKG31)</code>&nbsp;&nbsp;&nbsp;Birmingham
  • <code>00CQ (UKG33)</code>&nbsp;&nbsp;&nbsp;Coventry
  • <code>00CR (UKG34)</code>&nbsp;&nbsp;&nbsp;Dudley
  • <code>00CS (UKG34)</code>&nbsp;&nbsp;&nbsp;Sandwell
  • <code>00CT (UKG32)</code>&nbsp;&nbsp;&nbsp;Solihull
  • <code>00CU (UKG35)</code>&nbsp;&nbsp;&nbsp;Walsall
  • <code>00CW (UKG35)</code>&nbsp;&nbsp;&nbsp;Wolverhampton
  • West Yorkshire districts
  • <code>00CX (UKE41)</code>&nbsp;&nbsp;&nbsp;Bradford
  • <code>00CY (UKE43)</code>&nbsp;&nbsp;&nbsp;Calderdale
  • <code>00CZ (UKE43)</code>&nbsp;&nbsp;&nbsp;Kirklees
  • <code>00DA (UKE42)</code>&nbsp;&nbsp;&nbsp;Leeds
  • <code>00DB (UKE43)</code>&nbsp;&nbsp;&nbsp;Wakefield

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.

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

Non-metropolitan counties

Wales

These codes became active following local government changes in 1996.

  • <code>00NA (UKL11)</code>&nbsp;&nbsp;&nbsp;Isle of Anglesey
  • <code>00NC (UKL12)</code>&nbsp;&nbsp;&nbsp;Gwynedd
  • <code>00NE (UKL13)</code>&nbsp;&nbsp;&nbsp;Conwy
  • <code>00NG (UKL13)</code>&nbsp;&nbsp;&nbsp;Denbighshire
  • <code>00NJ (UKL23)</code>&nbsp;&nbsp;&nbsp;Flintshire
  • <code>00NL (UKL23)</code>&nbsp;&nbsp;&nbsp;Wrexham
  • <code>00NN (UKL24)</code>&nbsp;&nbsp;&nbsp;Powys
  • <code>00NQ (UKL14)</code>&nbsp;&nbsp;&nbsp;Ceredigion
  • <code>00NS (UKL14)</code>&nbsp;&nbsp;&nbsp;Pembrokeshire
  • <code>00NU (UKL14)</code>&nbsp;&nbsp;&nbsp;Carmarthenshire
  • <code>00NX (UKL18)</code>&nbsp;&nbsp;&nbsp;Swansea
  • <code>00NZ (UKL17)</code>&nbsp;&nbsp;&nbsp;Neath Port Talbot
  • <code>00PB (UKL17)</code>&nbsp;&nbsp;&nbsp;Bridgend
  • <code>00PD (UKL22)</code>&nbsp;&nbsp;&nbsp;Vale of Glamorgan
  • <code>00PF (UKL15)</code>&nbsp;&nbsp;&nbsp;Rhondda Cynon Taff
  • <code>00PH (UKL15)</code>&nbsp;&nbsp;&nbsp;Merthyr Tydfil
  • <code>00PK (UKL16)</code>&nbsp;&nbsp;&nbsp;Caerphilly
  • <code>00PL (UKL16)</code>&nbsp;&nbsp;&nbsp;Blaenau Gwent
  • <code>00PM (UKL16)</code>&nbsp;&nbsp;&nbsp;Torfaen
  • <code>00PP (UKL21)</code>&nbsp;&nbsp;&nbsp;Monmouthshire
  • <code>00PR (UKL21)</code>&nbsp;&nbsp;&nbsp;Newport
  • <code>00PT (UKL22)</code>&nbsp;&nbsp;&nbsp;Cardiff

Scotland

These codes became active following local government changes in 1996.

Northern Ireland

  • <code>95A (UKN04)</code>&nbsp;&nbsp;&nbsp;Derry
  • <code>95B (UKN04)</code>&nbsp;&nbsp;&nbsp;Limavady
  • <code>95C (UKN04)</code>&nbsp;&nbsp;&nbsp;Coleraine
  • <code>95D (UKN04)</code>&nbsp;&nbsp;&nbsp;Ballymoney
  • <code>95E (UKN04)</code>&nbsp;&nbsp;&nbsp;Moyle
  • <code>95F (UKN03)</code>&nbsp;&nbsp;&nbsp;Larne
  • <code>95G (UKN03)</code>&nbsp;&nbsp;&nbsp;Ballymena
  • <code>95H (UKN05)</code>&nbsp;&nbsp;&nbsp;Magherafelt
  • <code>95I (UKN05)</code>&nbsp;&nbsp;&nbsp;Cookstown
  • <code>95J (UKN04)</code>&nbsp;&nbsp;&nbsp;Strabane
  • <code>95K (UKN05)</code>&nbsp;&nbsp;&nbsp;Omagh
  • <code>95L (UKN05)</code>&nbsp;&nbsp;&nbsp;Fermanagh
  • <code>95M (UKN05)</code>&nbsp;&nbsp;&nbsp;Dungannon and South Tyrone
  • <code>95N (UKN03)</code>&nbsp;&nbsp;&nbsp;Craigavon
  • <code>95O (UKN05)</code>&nbsp;&nbsp;&nbsp;Armagh
  • <code>95P (UKN05)</code>&nbsp;&nbsp;&nbsp;Newry and Mourne
  • <code>95Q (UKN03)</code>&nbsp;&nbsp;&nbsp;Banbridge
  • <code>95R (UKN03)</code>&nbsp;&nbsp;&nbsp;Down
  • <code>95S (UKN02)</code>&nbsp;&nbsp;&nbsp;Lisburn
  • <code>95T (UKN03)</code>&nbsp;&nbsp;&nbsp;Antrim
  • <code>95U (UKN02)</code>&nbsp;&nbsp;&nbsp;Newtownabbey
  • <code>95V (UKN02)</code>&nbsp;&nbsp;&nbsp;Carrickfergus
  • <code>95W (UKN02)</code>&nbsp;&nbsp;&nbsp;North Down
  • <code>95X (UKN03)</code>&nbsp;&nbsp;&nbsp;Ards
  • <code>95Y (UKN02)</code>&nbsp;&nbsp;&nbsp;Castlereagh
  • <code>95Z (UKN01)</code>&nbsp;&nbsp;&nbsp;Belfast

References

External links