Old Hatfield is a village in Hertfordshire, England.
It is situated within the AL9 postcode district, which is within the Hatfield post town.
The full list of postcode districts within the Hatfield post town is as follows:
The Hatfield post town is within the St Albans postcode area.
Administrative Ward: Hatfield East
Administrative District: Welwyn Hatfield
Administrative County: Hertfordshire
Country: England
UK Parliament: Welwyn Hatfield
NHS Local Health Authority: East of England
NHS Region: North, Midlands and the East