Newnham is a village in Hertfordshire, England.
It is situated within the SG7 postcode district, which is within the Baldock post town.
SG7 is the only postcode district within the Baldock post town.
The Baldock post town is within the Stevenage postcode area.
Administrative Ward: Arbury
Administrative District: North 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