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The Office for National Statistics coding system is a hierarchical code used in the United Kingdommarker for tabulating census and other statistical data.

Authorities, wards, and census areas

The code is constructed top down from a 4 character code representing a unitary authority or administrative county & district, eg:

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


Local Government wards have a two-letter code within their local authority, and Census Output Areas an additional 4 digits within a ward. Census Output Areas (OAs) are the smallest unit for which census data is published - they contain at least 40 households (preferably 100), and are built up from postcode blocks after the census data is available, with a view to being socially as homogeneous as possible. A new set of Output Areas will be created for each decennial census. Census 2001 was the first to use this system - previously census data was published for larger Enumeration Districts which were delineated before the census was conducted. Enumeration Districts are still used for the collection of data but not for publication.

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


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

Civil parishes

An overlapping system encodes Civil Parish areas. Parishes are represented by an additional 3 digits within their local authority:

12UD Fenland district
12UD010 Tydd St. Giles parish


Super Output Areas

Super Output Areas (SOAs) are a set of geographies developed after the 2001 census. The aim was to produce a set of areas of consistent size, whose boundaries would not change (unlike electoral wards). They are an aggregation of adjacent Output Areas with similar social characteristics. Lower Layer SOAs typically contain 4 to 6 OAs with a population of around 1500. Middle Layer SOAs on average have a population of 7,200. Upper Layer SOAs are still being calculated; they are expected to cover a population of at least 25,000 each.

ONS codes for counties & districts

Also showing NUTS codes thus: (UKH12)

Single-tier districts



Two-tier counties & districts



Northern Ireland districts



Non-hierarchical codes for summary data in metropolitan areas



2009 structural changes

The following changes were made on 1 April 2009 to reflect the 2009 structural changes to local government in England.

Current LA Name Current LA Code Description New UA code
Bedfordmarker 09UD 1 district abolished – 1 unitary

authority created which will be

called Bedford		 00KB
Mid Bedfordshiremarker

South Bedfordshire		 09UC

09UE		 2 districts abolished – 1 unitary

authority created which will be

called Central Bedfordshire		 00KC
Congletonmarker

Crewe and Nantwichmarker

Macclesfieldmarker		 13UC

13UD

13UG		 3 districts abolished – 1 unitary

authority created which will be

called Cheshire East		 00EQ
Chester

Ellesmere Port and Nestonmarker

Vale Royalmarker		 13UB

13UE

13UH		 3 districts abolished – 1 unitary

authority created which will be

called Cheshire West and Chestermarker		 00EW
Caradonmarker

Carrickmarker

Kerriermarker

North Cornwallmarker

Penwithmarker

Restormelmarker		 15UB

15UC

15UD

15UE

15UF

15UG		 6 districts abolished - 1 unitary

authority created which will be

called Cornwallmarker		 00HE
Isles of Scillymarker 15UH Coding change only 00HF
Chester-le-Streetmarker

Derwentsidemarker

Durham

Easingtonmarker

Sedgefieldmarker

Teesdalemarker

Wear Valleymarker		 20UB

20UD

20UE

20UF

20UG

20UH

20UJ		 7 districts abolished – 1 unitary

authority created which will be

called County Durham		 00EJ
Alnwickmarker

Berwick-upon-Tweedmarker

Blyth Valleymarker

Castle Morpethmarker

Tynedalemarker

Wansbeckmarker		 35UB

35UC

35UD

35UE

35UF

35UG		 6 districts abolished – 1 unitary

authority created which will be

called Northumberlandmarker		 00EM
Bridgnorthmarker

North Shropshiremarker

Oswestrymarker

Shrewsbury and Atchammarker

South Shropshiremarker		 39UB

39UC

39UD

39UE

39UF		 5 districts abolished – 1 unitary

authority created which will be

called Shropshiremarker		 00GG
Kennetmarker

North Wiltshiremarker

Salisburymarker

West Wiltshire		 46UB

46UC

46UD

46UF		 4 districts abolished – 1 unitary

authority created which will be

called Wiltshiremarker		 00HY


References

External links




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