Berkhamsted is a market town in Hertfordshire, England. Located in the Bulbourne Valley, it is 26 miles (42 km) north-west of London and had a population of 21,245 at the 2021 census. The town is a civil parish within the borough of Dacorum, which is based in the neighbouring large new town of Hemel Hempstead. Berkhamsted, along with the adjoining village of Northchurch, is surrounded by countryside and the Chiltern Hills, an Area of Outstanding Natural Beauty.