Initial creation

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.^[2] This resulted in 61 county boroughs in England and two in Wales (Cardiff and Swansea). Several exceptions were allowed, mainly for historic towns, including Bath and Dudley, which would still remain below the 50,000 limit by the time of the 1901 census. Some of the smaller counties corporate—Berwick upon Tweed, Lichfield, Poole, Carmarthen and Haverfordwest—did not become county boroughs, although Canterbury, with a population under 25,000, did.

Growth

The county councils and county borough councils came into operation on 1 April 1889. Just seven months later, on 9 November 1889, the city of Oxford was the first borough which had not been made a county borough by the 1888 Act to be elevated to county borough status.^[3] Various other new county boroughs were constituted in the following decades, generally as more boroughs reached the 50,000 minimum and then promoted Acts to constitute them county boroughs. The granting of county borough status was the subject of much disagreement between the large municipal boroughs and the county councils. The population limit provided county councils with a disincentive to allow mergers or boundary amendments to districts that would create authorities with large populations, as this would allow them to seek county borough status and remove the tax base from the administrative county.

County boroughs to be constituted in this era were a mixed bag, including some towns that would continue to expand such as Bournemouth and Southend-on-Sea. Other towns such as Burton upon Trent and Dewsbury were not to increase in population much past 50,000. 1913 saw the attempts of Luton and Cambridge to gain county borough status defeated in the House of Commons, despite the approval of the Local Government Board – the removal of Cambridge from Cambridgeshire would have reduced the income of Cambridgeshire County Council by over half.

Slowdown

Upon recommendation of a commission chaired by the Earl of Onslow, the population threshold was raised to 75,000 in 1926, by the Local Government (County Boroughs and Adjustments) Act 1926, which also made it much harder to expand boundaries. The threshold was raised to 100,000 by the Local Government Act 1958.

The viability of the county borough of Merthyr Tydfil came into question in the 1930s. Due to a decline in the heavy industries of the town, by 1932 more than half the male population was unemployed, resulting in very high municipal rates in order to make public assistance payments. At the same time the population of the borough was lower than when it had been created in 1908.^[4] A royal commission was appointed in May 1935 to "investigate whether the existing status of Merthyr Tydfil as a county borough should be continued, and if not, what other arrangements should be made".^[5] The commission reported the following November, and recommended that Merthyr should revert to the status of a non-county borough, and that public assistance should be taken over by central government. In the event county borough status was retained by the town, with the chairman of the Welsh Board of Health appointed as administrative adviser in 1936.^[6]

After the Second World War the creation of new county boroughs in England and Wales was effectively suspended, pending a local government review. A government white paper published in 1945 stated that "it is expected that there will be a number of Bills for extending or creating county boroughs" and proposed the creation of a boundary commission to bring coordination to local government reform. The policy in the paper also ruled out the creation of new county boroughs in Middlesex "owing to its special problems".^[7] The Local Government Boundary Commission was appointed on 26 October 1945, under the chairmanship of Sir Malcolm Trustram Eve,^[8] delivering its report in 1947.^[9] The commission recommended that towns with a population of 200,000 or more should become one-tier "new counties", with "new county boroughs" having a population of 60,000 – 200,000 being "most-purpose authorities", with the county council of the administrative county providing certain limited services. The report envisaged the creation of 47 two-tiered "new counties", 21 one-tiered "new counties" and 63 "new county boroughs". The recommendations of the commission extended to a review of the division of functions between different tiers of local government, and thus fell outside its terms of reference, and its report was not acted upon.

Partial reform

The next attempt at reform was by the Local Government Act 1958, which established the Local Government Commission for England and the Local Government Commission for Wales to carry out reviews of existing local government structures and recommend reforms. Although the Commissions did not complete their work before being dissolved, a handful of new county boroughs were constituted between 1964 and 1968. Luton, Torbay, and Solihull gained county borough status. Additionally, the Teesside was formed from a merger of the existing county borough of Middlesbrough, and the municipal boroughs of Stockton-on-Tees, Redcar and Thornaby; Warley was formed from the county borough of Smethwick and the non-county boroughs of Oldbury and Rowley Regis; and West Hartlepool was merged with Hartlepool. Following these changes, there was a total of 79 county boroughs in England. The Commission also recommended the downgrading of Barnsley to be a non-county borough, but this was not carried out.

Abolition

The county boroughs of East Ham, West Ham and Croydon were abolished in 1965 with the creation of Greater London and went on to form parts of London boroughs. The remaining county boroughs were abolished in 1974 under the Local Government Act 1972, and replaced with non-metropolitan districts and metropolitan districts, all beneath county councils in a two-tier structure. In Greater London and the metropolitan counties the lower tier districts retained a wider range of powers than in the non-metropolitan counties.

Revival

This situation did not persist long. In 1986 the metropolitan county councils and the Greater London Council were abolished, returning the metropolitan boroughs to a status equivalent to the former county boroughs, but sharing some powers (police and transport for example). In the 1990s, many of the nonmetropolitan former county boroughs were reformed again as unitary authorities – essentially the same as a county borough. As a result, by 2015, most former county boroughs were either metropolitan boroughs or unitary authorities with a status similar to the old county boroughs. In England, most of those former county boroughs that did not gain unitary authority status—Barrow-in-Furness, Burnley, Canterbury, Carlisle, Chester, Eastbourne, Gloucester, Great Yarmouth, Hastings, Ipswich, Lincoln, Northampton, Norwich, Oxford, Preston, and Worcester—have given their names to non-unitary local government districts (in some cases coterminous with the old county borough, in other cases much larger). Burton upon Trent became an unparished area in the East Staffordshire borough, and has now been divided into several parishes.

In Wales, several principal areas are county boroughs:^[10]

• Newport (acquired city status in 2002)
• Merthyr Tydfil
• Caerphilly
• Blaenau Gwent
• Torfaen
• Vale of Glamorgan
• Bridgend
• Rhondda Cynon Taf
• Neath Port Talbot
• Wrexham
• Conwy

For all practical purposes, county boroughs are exactly the same as the other principal areas of Wales called "counties" (including "cities and counties") as all these areas are run by unitary authorities (i.e.: have the functions of both boroughs and counties). Although unitary authorities are functionally equivalent to county boroughs, only in Wales is the title given official recognition by Act of Parliament.^[10]