Mongewell is a village in Oxfordshire, England.
It is situated within the OX10 postcode district, which is within the Wallingford post town.
OX10 is the only postcode district within the Wallingford post town.
The Wallingford post town is within the Oxford postcode area.
Administrative Ward: Crowmarsh
Administrative District: South Oxfordshire
Administrative County: Oxfordshire
Country: England
UK Parliament: Henley
NHS Local Health Authority: South Central
NHS Region: Southern