Gilston is a village in Hertfordshire, England.
It is situated within the CM20 postcode district, which is within the Harlow post town.
The full list of postcode districts within the Harlow post town is as follows:
The Harlow post town is within the Chelmsford postcode area.
Administrative Ward: Hunsdon
Administrative District: East Hertfordshire
Administrative County: Hertfordshire
Country: England
UK Parliament: Hertford and Stortford
NHS Local Health Authority: East of England
NHS Region: North, Midlands and the East