Chiswick St Nicholas was an ancient, and later civil, parish in the Ossulstone hundred of Middlesex.
 Until 1834 its vestry governed most parish affairs.
After the Poor Law Amendment Act (1834), local administration in Chiswick began to be devolved to authorities beyond the vestry.
 Then, Chiswick poor relief was administered by the Brentford Poor Law Union.
Briefly, from 1849 to 1855, responsibility for Chiswick drains and sewers passed to the Metropolitan Commission of Sewers under its 'Fulham and Hammersmith Sewer District.'
 From 1858, under the Chiswick Improvement Act of that year, responsibility for drains and sewers, paving and lighting was vested in an elected board of eighteen Improvement Commissioners.
This operated as Chiswick's secular local authority for a quarter of a century until its replacement with a Local Board in 1883.
  In 1878 the parish gained a triangle of land in the east which had formed a detached part of Ealing.
From 1894 to 1927 the parish formed the Chiswick Urban District.
In 1927 it was abolished and its former area was merged with that of Brentford Urban District to form Brentford and Chiswick Urban District.
The amalgamated district became a municipal borough in 1932.
The borough of Brentford and Chiswick was abolished in 1965, and its former area was transferred to Greater London to form part of the London Borough of Hounslow.
With these changes, Chiswick Town Hall is no longer the local government centre but is still used for some council services.
There was a Brentford and Chiswick Parliament constituency from 1918 to 1974.

Chiswick forms part of the Brentford and Isleworth Parliament constituency.
The MP is Ruth Cadbury (Labour), elected at the May 2015 general election replacing Mary Macleod (Conservative).
For elections to the London Assembly Chiswick is in the South West constituency, represented since 2000 by Tony Arbour, of the Conservative Party.
For elections to Hounslow London Borough Council, Chiswick is represented by three electoral wards: Turnham Green, Chiswick Homefields and Chiswick Riverside.
Each ward elects three councillors, who serve four-year terms.
For 2010–14, all nine councillors were Conservatives.
It was one of 35 major centres identified in the statutory planning document of Greater London, the London Plan of 2008.
Chiswick St Nicholas was an ancient, and later civil, parish in the Ossulstone hundred of Middlesex.  Until 1834 its vestry governed most parish affairs. After the Poor Law Amendment Act (1834), local administration in Chiswick began to be devolved to authorities beyond the vestry.  Then, Chiswick poor relief was administered by the Brentford Poor Law Union. Briefly, from 1849 to 1855, responsibility for Chiswick drains and sewers passed to the Metropolitan Commission of Sewers under its 'Fulham and Hammersmith Sewer District.'  From 1858, under the Chiswick Improvement Act of that year, responsibility for drains and sewers, paving and lighting was vested in an elected board of eighteen Improvement Commissioners. This operated as Chiswick's secular local authority for a quarter of a century until its replacement with a Local Board in 1883.   In 1878 the parish gained a triangle of land in the east which had formed a detached part of Ealing. From 1894 to 1927 the parish formed the Chiswick Urban District. In 1927 it was abolished and its former area was merged with that of Brentford Urban District to form Brentford and Chiswick Urban District. The amalgamated district became a municipal borough in 1932. The borough of Brentford and Chiswick was abolished in 1965, and its former area was transferred to Greater London to form part of the London Borough of Hounslow. With these changes, Chiswick Town Hall is no longer the local government centre but is still used for some council services. There was a Brentford and Chiswick Parliament constituency from 1918 to 1974.
Chiswick forms part of the Brentford and Isleworth Parliament constituency. The MP is Ruth Cadbury (Labour), elected at the May 2015 general election replacing Mary Macleod (Conservative). For elections to the London Assembly Chiswick is in the South West constituency, represented since 2000 by Tony Arbour, of the Conservative Party. For elections to Hounslow London Borough Council, Chiswick is represented by three electoral wards: Turnham Green, Chiswick Homefields and Chiswick Riverside. Each ward elects three councillors, who serve four-year terms. For 2010–14, all nine councillors were Conservatives. It was one of 35 major centres identified in the statutory planning document of Greater London, the London Plan of 2008.
Chiswick