Woolmer Green is a village in Hertfordshire, England.
It is situated within the SG3 postcode district, which is within the Knebworth post town.
SG3 is the only postcode district within the Knebworth post town.
The Knebworth post town is within the Stevenage postcode area.
Administrative Ward: Welwyn 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