Information source: Wikipedia: Counties of England
| 1890-1965: |
- Yorkshire split into Ridings
- Lincolnshire split into Parts
- Sussex split into E & W
- Suffolk split into E & W
- Northants split into Northants and Soke of Peterborough
- Cambs split into Cambs and Isle of Ely
- Hants split into Hants and IOW
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| 1965-1974: |
- County of London expanded to Greater London
- Middlesex swallowed mainly by Greater London, but also partly by Surrey and Herts
- Soke of Peterborough and Huntingdonshire merged into Huntingdon and Peterborough
- Isle of Ely merged into Cambs
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| 1974-1995: |
Metropolitan counties created:
- Merseyside - based around Liverpool, south-west Lancashire, along with, from the other side of the River Mersey, the Wirral in north-west Cheshire
- Greater Manchester - the Manchester urban area along with many surrounding towns
- South Yorkshire - based upon the Sheffield-Rotherham area in the West Riding of Yorkshire
- Tyne and Wear - the Tyneside conurbation based on Newcastle-upon-Tyne in Northumberland, along with Sunderland in County Durham
- West Midlands - Birmingham conurbation, including the Black Country and Coventry
- West Yorkshire - Leeds-Bradford area in the West Riding
Other significant changes were:
- Avon formed from northern Somerset, southern Gloucestershire, and Bristol and Bath
- Cleveland formed from southern Durham and northern part of the North Riding, focusing on the Teesside conurbation along with Guisborough and Hartlepool
- Cumbria was formed from Westmorland, Cumberland and part of Lancashire and Yorkshire
- Herefordshire and Worcestershire were merged into Hereford and Worcester
- Humberside formed from eastern Yorkshire and northern Lincolnshire
- Huntingdon and Peterborough was annexed by Cambridgeshire
- Rutland was merged into Leicestershire as a district
- Vale of White Horse, including Berkshire's former county town Abingdon was ceded to Oxfordshire
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| 1995: |
- Unitary Authorities start to replace two-tier structures
- Avon, Humberside and Cleveland abolished in 1996
- Rutland becomes separate UA in 1997
- Hereford & worcester split in 1998 back into Herefordshire UA and Worcestershire county
- Berkshire was split into six unitary authorities in 1998, but not formally abolished
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Information source: Wikipedia: Counties of Wales
| 1889-1974: |
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| 1974-1996: |
- Replaced by 8 two-tier authorities
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| 1996: |
- Unitary Authorities introduced
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