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'''1945-1950''': The Urban Districts of Barnet (the civil parishes of Arkley, Chipping Barnet, Hadley, Rowley, South Mimms Urban, and Totteridge) and East Barnet (the civil parishes of Barnet Vale, East Barnet, and Monken Hadley), and the Rural District of Elstree (the civil parishes of Elstree, Ridge, and Shenley).
'''1945-1950''': The Urban Districts of Barnet and East Barnet, and the Rural District of Elstree.
'''1950-1955''': The Urban Districts of Barnet and East Barnet, and the Rural Districts of Elstree and Hatfield (the civil parishes of Bishops Hatfield, Essendon, Northaw, and North Mimms).
'''1950-1955''': The Urban Districts of Barnet and East Barnet, and the Rural Districts of Elstree and Hatfield.
'''1955-1974''': The Urban Districts of Barnet and East Barnet, and the Rural District of Elstree.
'''1955-1974''': The Urban Districts of Barnet and East Barnet, and the Rural District of Elstree.
1945-1950: The Urban Districts of Barnet and East Barnet, and the Rural District of Elstree.
1950-1955: The Urban Districts of Barnet and East Barnet, and the Rural Districts of Elstree and Hatfield.
1955-1974: The Urban Districts of Barnet and East Barnet, and the Rural District of Elstree.
The constituency was created in 1945 when the number of parliamentary constituencies in Hertfordshire was increased from five to six. Previously the area had been part of the St Albans seat. This was one of the English constituencies divided as an emergency measure, before the general review of parliamentary constituencies due later in the decade, because its electorate exceeded 100,000 voters.
In 1965 the Barnet and East Barnet urban districts were transferred to Greater London, becoming part of the London Borough of Barnet, while Elstree Rural District remained part of Hertfordshire. This did not affect parliamentary boundaries for nine years, however.