Harpenden is a town and civil parish located within the City and District of St Albans in the county of Hertfordshire, England. It serves as a residential area with a population of 31,128 for the civil parish as of the 2021 census.
The town functions primarily as a commuter hub, benefiting from a direct rail connection to Central London. The population of its built-up area was recorded at 30,674 during the same census period.