The district was subject to a number of boundary changes, which incorporated territory from Eton Rural District. In 1900 the urban district gained part of Langley Marish and more of the Upton cum Chalvey civil parishes. In 1930, as part of a county review order, it gained of Burnham, Dorney, Farnham Royal, Horton, Langley Marish and Stoke Poges. In 1931, as part of another county review order, it gained of Farnham Royal and Stoke Poges.
A coat of arms and motto were granted on 3 September 1938. The coat of arms depicts a swan, the county emblem of Buckinghamshire and brick-axes, indicating local brick-making. The sign for Uranus is taken from the arms of the Herschel family, referring to the discovery of the planet by astronomer William Herschel. The supporters are symbols of trade and industry. The motto Fiducia et vi means 'By confidence and strength'.
The parish of Upton-cum-Chalvey was, for poor law purposes, included in the Eton Poor Law Union and represented on its Board of Guardians from 1835. This was the first partially elected local government body including a portion of the area which now forms the modern Borough. The whole parish elected one Guardian, later rising to two and three thereafter. Some other parishes, now wholly or partially in the present Borough, were also part of the Eton Union. Langley Marish, to the east of Upton-cum-Chalvey, elected two Guardians in 1835. Wexham to the north had one representative on the Board, as did Stoke Poges, Farnham Royal and Burnham. In 1894, with the establishment of civil parishes and Urban District Councils, Upton-cum-Chalvey was for civil purposes reduced to the part of the traditional parish not then included in Slough. It continued to send two members to the Board of Guardians, who also served on the Eton Rural District Council, until the area was incorporated in Slough Urban District in 1900. The Slough Urban District area elected two members of the Board of Guardians from 1894 until 1901, when the expanded Urban District returned four Guardians. In 1907 Slough was given six seats on the Board. This representation continued until 1930, when the poor law Unions and Boards of Guardians were abolished and their functions transferred to County Councils.
When elected County Councils were introduced in 1889 Slough returned one County Councillor. In 1904 the enlarged Slough was split into three single-member County Electoral Divisions. Following the expansion of Slough in 1930–1931 the Urban District of Slough continued to be represented in the County Council until the reorganisation of local government led to the abolition of the first Buckinghamshire County Council in 1974. Buckinghamshire County Electoral Divisions in Slough 1889–1974
1889–1904 1
1904–1931 3
1931–1934 4
1934–1952 6
1952–1974 9
Slough and Upton-cum-Chalvey civil parishes
In 1894 the Slough urban sanitary district became a distinct civil parish, as did the rest of Upton-cum-Chalvey. The civil parish of Slough was the same year converted to Slough Urban District. Upton-cum-Chalvey civil parish elected an eleven-member Parish Council, which administered the area until the merger with Slough in 1900. The western part of the Langley Marish area was also incorporated in the expanded Urban District. The rest of Langley was not added to Slough until the 1930–31 boundary changes.
Abolition
The borough was abolished in 1974 and its former area was combined with part of Eton Rural District to form the borough of Slough in Berkshire.
