Prisoners' families Prison Visitors' Guides HMP The Mount Address: HMP The Mount Molyneaux AvenueBovingdonHemel HempsteadHertsHP3 0NZ Visitor services at The Mount are managed by HACRO. Visits information can be found at www.justice.gov.uk/contacts/prison-finder/the-mount or you can ring the main prison switchboard on 01442 836300.