13 August 1888
The Counties Corporate lost their Corporate status and Sheriffs lost their powers.
When county councils were first created in 1889, it was decided that to let them have authority over large towns or cities would be impractical, and so any large incorporated place would have the right to be a county borough, and thus independent from the administrative county it would otherwise come under. Some cities and towns were already independent counties corporate, and most were to become county boroughs.
Originally ten county boroughs were proposed; Bristol, Hull, Newcastle upon Tyne and Nottingham, which were already counties, and Birmingham, Bradford, Leeds, Liverpool, Manchester, and Sheffield, which were not.
The Local Government Act 1888 as eventually passed required a population of over 50,000 except in the case of existing counties corporate. This resulted in 61 county boroughs in England and two in Wales.
Several exceptions were allowed, mainly for historic towns: Bath, Dudley and Oxford were all under the 50,000 limit in the 1901 census. Some of the smaller counties corporate—Berwick upon Tweed, Lichfield, Lincoln, Poole, Carmarthen and Haverfordwest—did not become county boroughs, although Canterbury, with a population under 25,000, did.