Hitchin View from Market Square in Hitchin, with St Mary's Church in the background Hitchin Hitchin shown within Hertfordshire Population 33,352 (2011)[1] OS grid reference TL181292 District North Hertfordshire Shire county Hertfordshire Region East Country England Sovereign state United Kingdom Post town HITCHIN Postcode district SG4, SG5 Dialling code 01462 Police Hertfordshire Fire Hertfordshire Ambulance East of England EU Parliament East of England UK Parliament Hitchin and Harpenden