In its current form (post-2024 boundary changes), the seat covers the new town of Hemel Hempstead which is a significant employment centre, as well as a rural area of the Chilterns to the south-west, including the villages of Bovingdon and Flaunden. Residents are slightly wealthier than the UK average.[3]
Harpenden was transferred back to St Albans in 1974 and the constituency was temporarily abolished from 1983 to 1997 during which time it was replaced by West Hertfordshire.
The Rural Districts of Berkhamsted and Hemel Hempstead.[6]
Harpenden and the part of the parishes of Harpenden Rural and Redbourn were transferred back to St Albans.
The constituency was abolished for the 1983 general election. Berkhamsted and the area to the south of Hemel Hempstead, including Kings Langley, was transferred to South West Hertfordshire. The remainder, including Hemel Hempstead and Tring, formed the new constituency of West Hertfordshire.
The District of Dacorum wards of Adeyfield East, Adeyfield West, Ashridge, Bennetts End, Boxmoor, Central, Chaulden, Crabtree, Cupid Green, Flamstead and Markyate, Gadebridge, Grove Hill, Highfield, Kings Langley, Leverstock Green, Nash Mills, South, and Warners End.[7]
Re-established for the 1997 general election from the bulk of the abolished County Constituency of West Hertfordshire (excluding Tring). Kings Langley transferred back from South West Hertfordshire.
The District of Dacorum wards of Adeyfield East, Adeyfield West, Apsley, Ashridge, Bennetts End, Boxmoor, Chaulden and Shrubhill, Corner Hall, Gadebridge, Grove Hill, Hemel Hempstead Central, Highfield and St Paul's, Kings Langley, Leverstock Green, Nash Mills, Warners End, Watling, and Woodhall.[8]
Minor loss to South West Hertfordshire following revision of local authority wards.
The District of Dacorum wards of: Adeyfield East; Adeyfield West; Apsley and Corner Hall; Bennetts End; Bovingdon, Flaunden and Chipperfield; Boxmoor; Chaulden and Warners End; Gadebridge; Grovehill; Hemel Hempstead Town; Highfield; Leverstock Green; Nash Mills; Woodhall Farm.[9]
Moderate changes, with Kings Langley being transferred to South West Hertfordshire, in exchange for the rural Bovingdon, Flaunden and Chipperfield ward. The rural Ashridge and Watling wards to the north were moved to the newly created seat of Harpenden and Berkhamsted.
General Election 1939–40:
Another general election was required to take place before the end of 1940. The political parties had been making preparations for an election to take place from 1939 and by the end of this year, the following candidates had been selected;
Craig, F. W. S. (1983) [1969]. British parliamentary election results 1918-1949 (3rd ed.). Chichester: Parliamentary Research Services. ISBN0-900178-06-X.