Boundary changes · Local authority district · 2023

The 2023 local authority district changes

17 local authority district codes were replaced on 1 April 2023, creating 4 new codes across 17 predecessor-to-successor relationships.

17 codes replaced

4 codes created

17 predecessor-to-successor relationships

The instruments behind these changes

The Cumbria (Structural Changes) Order 2022 SI 328/2022
The North Yorkshire (Structural Changes) Order 2022 SI 329/2022
The Somerset (Structural Changes) Order 2022 SI 331/2022

Areas created

E06000065 North Yorkshire from 7: Craven, Hambleton, Harrogate, Richmondshire, Ryedale, Scarborough…
E06000066 Somerset from 4: Mendip, Sedgemoor, Somerset West and Taunton, South Somerset
E06000063 Cumberland from 3: Allerdale, Carlisle, Copeland
E06000064 Westmorland and Furness from 3: Barrow-in-Furness, Eden, South Lakeland

What changed

One row per replaced code. A code split across several successors lists all of them — that distinction is why this table exists, and it is the part a flat lookup loses.

Old code	Name	Replaced by	Successors
`E07000026`	Allerdale	`E06000063` Cumberland	1
`E07000027`	Barrow-in-Furness	`E06000064` Westmorland and Furness	1
`E07000028`	Carlisle	`E06000063` Cumberland	1
`E07000029`	Copeland	`E06000063` Cumberland	1
`E07000163`	Craven	`E06000065` North Yorkshire	1
`E07000030`	Eden	`E06000064` Westmorland and Furness	1
`E07000164`	Hambleton	`E06000065` North Yorkshire	1
`E07000165`	Harrogate	`E06000065` North Yorkshire	1
`E07000187`	Mendip	`E06000066` Somerset	1
`E07000166`	Richmondshire	`E06000065` North Yorkshire	1
`E07000167`	Ryedale	`E06000065` North Yorkshire	1
`E07000168`	Scarborough	`E06000065` North Yorkshire	1
`E07000188`	Sedgemoor	`E06000066` Somerset	1
`E07000169`	Selby	`E06000065` North Yorkshire	1
`E07000246`	Somerset West and Taunton	`E06000066` Somerset	1
`E07000031`	South Lakeland	`E06000064` Westmorland and Furness	1
`E07000189`	South Somerset	`E06000066` Somerset	1

Provenance

Source: Office for National Statistics, Code History Database (June 2026) — geoportal.statistics.gov.uk
Retrieved: 7 September 2026
Dataset version: CHD-2026-06
Licence: Open Government Licence v3.0
Method: /methodology/geography-vintages
Machine copies: JSON, CSV, Markdown

Cite this

Measure What's Important (UKMWI), 2026. The 2023 local authority district changes.
17 codes replaced, 4 created, effective 1 April 2023.
https://ukmwi.co.uk/changes/2023/local-authority-districts (accessed <date>).
Derived from the ONS Code History Database (CHD-2026-06) under the Open Government Licence v3.0.

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