Westmill is a village in Hertfordshire, England.
It is situated within the SG9 postcode district, which is within the Buntingford post town.
SG9 is the only postcode district within the Buntingford post town.
The Buntingford post town is within the Stevenage postcode area.
Administrative Ward: Mundens and Cottered
Administrative District: East Hertfordshire
Administrative County: Hertfordshire
Country: England
UK Parliament: North East Hertfordshire
NHS Local Health Authority: East of England
NHS Region: North, Midlands and the East