Postal area WD6

Elstree and Borehamwood is a civil parish in the Borough of Hertsmere in Hertfordshire. Located approximately 12 miles northwest of central London and adjacent to the Greater London boundary, it is an urbanised area with suburban residential development, some open land and light industry. The parish includes the settlements of Elstree and Borehamwood, which are divided from each other by the Midland Main Line. For postal addresses, the parish is almost entirely within the Borehamwood post town and the WD6 postcode district.

Elstree and Borehamwood is a recent renaming of the ancient parish of Elstree, covering the settlements of Elstree and Borehamwood. Formed in 1894 as the Elstree Parish Council, the local council is Elstree and Borehamwood Town Council. One of the most populous civil parishes in England, at the 2011 census it had a population of 37,065.

The Elstree telephone exchange building is within 12.5 miles of Oxford Circus and subscriber numbers therefore use the 020 code.

Elstree was an ancient parish in the Cashio Hundred of Hertfordshire. In 1894 it became part of the Barnet Rural District and the Elstree Parish Council was formed. Barnet Rural District became Elstree Rural District in 1941. The parish was part of the review area of the Royal Commission on Local Government in Greater London, however it did not form part of the proposed Greater London area.

In 1974 the parish became part of the Borough of Hertsmere. The Local Government Act 1972 permitted parish councils to become town councils and provided a mechanism for the name of the parish to be changed if the district council was in agreement. The parish name was subsequently changed to Elstree and Borehamwood and the parish council became Elstree and Borehamwood Town Council.

The boundaries of Elstree and Borehamwood were adjusted on 1 April 1993 when part of the village of Elstree was transferred from Greater London and the boroughs of Barnet and Harrow, to Hertfordshire.