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.