The Parliamentary Constituency of Hitchin & Harpenden was created in 1995 as a result of the Boundary Review. Since 1997 the constituency has been served by two Conservative Members of Parliament: the Rt Hon. Peter Lilley (now Lord Lilley) (1997-2017) and Bim Afolami (first elected in 2017).
The constituency spans North Hertfordshire District Council and St Albans City & District Council, and is made up of the following local government wards:
- Cadwell.
- Chesfield.
- Harpenden East.
- Harpenden North.
- Harpenden South.
- Harpenden West.
- Hitchin Bearton.
- Hitchin Highbury.
- Hitchin Oughton.
- Hitchin Priory.
- Hitchin Walsworth.
- Hitchwood, Offa and Hoo.
- Kimpton.
- Redbourn.
- Sandridge.
- Wheathampstead.